| | Texts | Author | Date |
|---|
| | August Bebel (by Lenin) | Lenin | 1913 |
| | Baptism Certificate of Friedrich Engels | Friedrich Engels | 1821 |
| | Certificate of Conduct for the One-Year Volunteer Friedrich Engels | Friedrich Engels | 1842 |
| | Comments on Engels' The Peasant War in Germany | David Riazanov | 1925 |
| | Conspectus of Bakunin’s Statism and Anarchy | Karl Marx | 1874 |
| | Conspectus of the Book The Holy Family by Marx and Engels | Lenin | 1895 |
| ∅ | Engels at home | Edward Aveling | 1895 |
| | Engels’ Edition of the Third Volume of Capital and Marx’s Original Manuscript | Michael Heinrich | 1996 |
| | Engels’ Letters to Kautsky | Leon Trotsky | 1935 |
| | Engels’s War Articles | Leon Trotsky | 1924 |
| | Frederick Engels (by Lenin) | Lenin | 1895 |
| | Frederick Engels : His Life, His Work and His Writings | Karl Kautsky | 1899 |
| | Friedrich Engels Senior to His Wife Elise, August 27, 1835 | Friedrich Engels | 1835 |
| | Friedrich Engels Senior to Karl Snethlage, December 1, 1820 | Friedrich Engels | 1820 |
| | Friedrich Engels Senior to Karl Snethlage, October 5, 1842 | Friedrich Engels | 1842 |
| | Friedrich Engels and Mathematics | Jean van Heijenoort | 1948 |
| | From Hermann Lopatin's Letter to Maria Oshanina | German Lopatin | 1883 |
| | How History Is Written. Dished Up to Order by Stalin’s Savants on Frederick Engels Anniversary | Leon Trotsky | 1935 |
| | Legal Proceedings against the Neue Rheinische Zeitung (5) | Karl Marx | 1848 |
| | Letter from Jenny Marx to Friedrich Engels, April 27, 1853 | Jenny von Westphalen | 1853 |
| | Letter from Karl Marx to Friedrich Engels, April 27, 1853 | Karl Marx
Jenny von Westphalen | 1853 |
| | Letter to Ferdinand Lassalle, February 25, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 1, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 10, 1856 | Karl Marx | 1856 |
| | Letter to Friedrich Engels, April 11, 1865 | Karl Marx | 1865 |
| | Letter to Friedrich Engels, April 11, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, April 12, 1855 | Karl Marx | 1855 |
| | Letter to Friedrich Engels, April 12, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 12, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, April 13, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, April 14, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, April 14, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, April 15, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, April 15, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 16, 1855 | Karl Marx | 1855 |
| | Letter to Friedrich Engels, April 16, 1856 | Karl Marx | 1856 |
| | Letter to Friedrich Engels, April 16, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 16, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, April 16, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 17, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, April 17, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, April 18, 1863 | Karl Marx | 1863 |
| | Letter to Friedrich Engels, April 18, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, April 18, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, April 19, 1854 | Karl Marx | 1854 |
| | Letter to Friedrich Engels, April 19, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 19, 1864 | Karl Marx | 1864 |
| | Letter to Friedrich Engels, April 19, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, April 2, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, April 2, 1858 | Karl Marx | 1858 |
| | Letter to Friedrich Engels, April 2, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, April 2, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, April 21, 1857 | Karl Marx | 1857 |
| | Letter to Friedrich Engels, April 21, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, April 22, 1854 | Karl Marx | 1854 |
| | Letter to Friedrich Engels, April 22, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 22, 1865 | Karl Marx | 1865 |
| | Letter to Friedrich Engels, April 22, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, April 23, 1849 | Karl Marx | 1849 |
| | Letter to Friedrich Engels, April 23, 1853 | Karl Marx | 1853 |
| | Letter to Friedrich Engels, April 23, 1857 | Karl Marx | 1857 |
| | Letter to Friedrich Engels, April 23, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, April 24, 1848 | Karl Marx | 1848 |
| | Letter to Friedrich Engels, April 24, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, April 24, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, April 24, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, April 24, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 26, 1853 | Karl Marx | 1853 |
| | Letter to Friedrich Engels, April 26, 1856 | Karl Marx | 1856 |
| | Letter to Friedrich Engels, April 26, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 28, 1853 | Karl Marx | 1853 |
| | Letter to Friedrich Engels, April 28, 1862 | Karl Marx | 1862 |
| | Letter to Friedrich Engels, April 28, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, April 28, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, April 29, 1854 | Karl Marx | 1854 |
| | Letter to Friedrich Engels, April 29, 1858 | Karl Marx | 1858 |
| | Letter to Friedrich Engels, April 29, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, April 30, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, April 30, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, April 4, 1854 | Karl Marx | 1854 |
| | Letter to Friedrich Engels, April 4, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, April 5, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 6, 1855 | Karl Marx | 1855 |
| | Letter to Friedrich Engels, April 6, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, April 7, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 8, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, April 8, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, April 9, 1857 | Karl Marx | 1857 |
| | Letter to Friedrich Engels, April 9, 1858 | Jenny von Westphalen | 1858 |
| | Letter to Friedrich Engels, April 9, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, April 9, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, April 9, 1863 | Karl Marx | 1863 |
| | Letter to Friedrich Engels, August 1, 1856 | Karl Marx | 1856 |
| | Letter to Friedrich Engels, August 1, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, August 1, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 1, 1877 | Karl Marx | 1877 |
| | Letter to Friedrich Engels, August 10, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, August 10, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, August 10, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, August 10, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, August 10, 1870 | Jenny von Westphalen | 1870 |
| | Letter to Friedrich Engels, August 10, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, August 12, 1870 | Eleanor Marx | 1870 |
| | Letter to Friedrich Engels, August 13, 1858 | Karl Marx | 1858 |
| | Letter to Friedrich Engels, August 13, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, August 13, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, August 13, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, August 14, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, August 14, 1857 | Jenny von Westphalen | 1857 |
| | Letter to Friedrich Engels, August 14, 1860 | Jenny von Westphalen | 1860 |
| | Letter to Friedrich Engels, August 14, 1862 | Karl Marx | 1862 |
| | Letter to Friedrich Engels, August 14, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, August 14, 1874 | Karl Marx | 1874 |
| | Letter to Friedrich Engels, August 14, 1879 | Karl Marx | 1879 |
| | Letter to Friedrich Engels, August 15, 1857 | Karl Marx | 1857 |
| | Letter to Friedrich Engels, August 15, 1863 | Karl Marx | 1863 |
| | Letter to Friedrich Engels, August 15, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 16, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, August 16, 1881 | Karl Marx | 1881 |
| | Letter to Friedrich Engels, August 17, 1849 | Karl Marx | 1849 |
| | Letter to Friedrich Engels, August 17, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, August 17, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 17, 1877 | Karl Marx | 1877 |
| | Letter to Friedrich Engels, August 18, 1853 | Karl Marx | 1853 |
| | Letter to Friedrich Engels, August 18, 1858 | Karl Marx | 1858 |
| | Letter to Friedrich Engels, August 18, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, August 18, 1881 | Karl Marx | 1881 |
| | Letter to Friedrich Engels, August 19, 1865 | Karl Marx | 1865 |
| | Letter to Friedrich Engels, August 19, 1871 | Karl Marx | 1871 |
| | Letter to Friedrich Engels, August 19, 1876 | Karl Marx | 1876 |
| | Letter to Friedrich Engels, August 19, 1881 | Karl Marx | 1881 |
| | Letter to Friedrich Engels, August 2, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, August 2, 1862 | Karl Marx | 1862 |
| | Letter to Friedrich Engels, August 2, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, August 20, 1862 | Karl Marx | 1862 |
| | Letter to Friedrich Engels, August 21, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, August 21, 1871 | Karl Marx | 1871 |
| | Letter to Friedrich Engels, August 21, 1875 | Karl Marx | 1875 |
| | Letter to Friedrich Engels, August 21, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, August 22, 1865 | Karl Marx | 1865 |
| | Letter to Friedrich Engels, August 22, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 23, 1849 | Karl Marx | 1849 |
| | Letter to Friedrich Engels, August 23, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, August 24, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, August 24, 1871 | Karl Marx | 1871 |
| | Letter to Friedrich Engels, August 24, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, August 25, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, August 25, 1879 | Karl Marx | 1879 |
| | Letter to Friedrich Engels, August 26, 1854 | Karl Marx | 1854 |
| | Letter to Friedrich Engels, August 26, 1857 | Karl Marx | 1857 |
| | Letter to Friedrich Engels, August 26, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, August 26, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, August 27, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, August 27, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, August 27, 1879 | Karl Marx | 1879 |
| | Letter to Friedrich Engels, August 28, 1879 | Karl Marx | 1879 |
| | Letter to Friedrich Engels, August 29, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, August 29, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, August 29, 1873 | Karl Marx | 1873 |
| | Letter to Friedrich Engels, August 3, 1861 | Karl Marx | 1861 |
| | Letter to Friedrich Engels, August 3, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 3, 1881 | Karl Marx | 1881 |
| | Letter to Friedrich Engels, August 3, 1882 | Karl Marx | 1882 |
| | Letter to Friedrich Engels, August 30, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, August 30, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 30, 1873 | Karl Marx | 1873 |
| | Letter to Friedrich Engels, August 31, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, August 31, 1864 | Karl Marx | 1864 |
| | Letter to Friedrich Engels, August 31, 1867 | Karl Marx | 1867 |
| | Letter to Friedrich Engels, August 4, 1860 | Karl Marx | 1860 |
| | Letter to Friedrich Engels, August 4, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, August 4, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, August 4, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 4, 1874 | Karl Marx | 1874 |
| | Letter to Friedrich Engels, August 5, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, August 5, 1865 | Karl Marx | 1865 |
| | Letter to Friedrich Engels, August 6, 1852 | Karl Marx | 1852 |
| | Letter to Friedrich Engels, August 7, 1855 | Karl Marx | 1855 |
| | Letter to Friedrich Engels, August 7, 1862 | Karl Marx | 1862 |
| | Letter to Friedrich Engels, August 7, 1866 | Karl Marx | 1866 |
| | Letter to Friedrich Engels, August 8, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, August 8, 1854 | Karl Marx | 1854 |
| | Letter to Friedrich Engels, August 8, 1858 | Karl Marx | 1858 |
| | Letter to Friedrich Engels, August 8, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, August 8, 1870 | Karl Marx | 1870 |
| | Letter to Friedrich Engels, August 8, 1877 | Karl Marx | 1877 |
| | Letter to Friedrich Engels, August 9, 1857 | Karl Marx | 1857 |
| | Letter to Friedrich Engels, August 9, 1862 | Karl Marx | 1862 |
| | Letter to Friedrich Engels, August 9, 1865 | Karl Marx | 1865 |
| | Letter to Friedrich Engels, August 9, 1881 | Karl Marx | 1881 |
| | Letter to Friedrich Engels, Before April 15, 1849 | Karl Marx | 1849 |
| | Letter to Friedrich Engels, Between January 13 and 15 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, December 1, 1851 | Karl Marx | 1851 |
| | Letter to Friedrich Engels, December 10, 1859 | Karl Marx | 1859 |
| | Letter to Friedrich Engels, December 10, 1864 | Karl Marx | 1864 |
| | Letter to Friedrich Engels, December 10, 1868 | Karl Marx | 1868 |
| | Letter to Friedrich Engels, December 10, 1869 | Karl Marx | 1869 |
| | Letter to Friedrich Engels, December 11, 1855 | Karl Marx | 1855 |
| | Letter to Friedrich Engels, December 11, 1858 | Karl Marx | 1858 |
| | Letter to Friedrich Engels, December 11, 1873 | Karl Marx | 1873 |
