| | Texts | Author | Date |
|---|
| | 25th anniversary of Marx’s death | Rosa Luxemburg | 1908 |
| | A Cadet Property-Owner Argues “According to Marx” | Lenin | 1913 |
| | An Estimate of Marx by International Liberalism | Lenin | 1908 |
| | August Bebel (by Lenin) | Lenin | 1913 |
| ∅ | Bakunin, Marx and freedom | Max Nomad | 1968 |
| | Biographical Comments on Karl Marx | Eleanor Marx | 1897 |
| | Biographical Notes on Marx’s Literary Interests | Eleanor Marx | |
| | Conspectus of Bakunin’s Statism and Anarchy | Karl Marx | 1874 |
| | Conspectus of the Book The Holy Family by Marx and Engels | Lenin | 1895 |
| | Correspondence Dr. Marx and Mr. Gladstone’s Budget Speech Of 1863 | Eleanor Marx
Sedley Taylor | 1884 |
| | Draft of a Speech at the Graveside of Karl Marx | Friedrich Engels | 1883 |
| | Engels’ Edition of the Third Volume of Capital and Marx’s Original Manuscript | Michael Heinrich | 1996 |
| | Ferdinand Lassalle as a social reformer | Eduard Bernstein | 1893 |
| ∅ | Flora Tristan and Karl Marx | Maximilien Rubel | 1946 |
| | Frederick Engels (by Lenin) | Lenin | 1895 |
| | From Hermann Lopatin's Letter to Maria Oshanina | German Lopatin | 1883 |
| | How Lenin Studied Marx | Leon Trotsky | 1936 |
| | Hyndman on Marx | Lenin | 1911 |
| | In the Case of Brentano vs Marx | Friedrich Engels | 1890 |
| | Karl Marx (by Eleanor Marx) | Eleanor Marx | 1883 |
| | Karl Marx (by Engels, 1869) | Friedrich Engels | 1869 |
| | Karl Marx (by Engels, 1877) | Friedrich Engels | 1877 |
| | Karl Marx (by Lenin, 1914) | Lenin | 1914 |
| | Karl Marx and Social Reform | Eduard Bernstein | 1897 |
| | Karl Marx's Funeral (Engels, 1883) | Friedrich Engels | 1883 |
| | Letter to Friedrich Engels, April 5, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, April 1, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, April 10, 1853 | Friedrich Engels | 1853 |
| | Letter to Karl Marx, April 10, 1866 | Friedrich Engels | 1866 |
| | Letter to Karl Marx, April 10, 1868 | Friedrich Engels | 1868 |
| | Letter to Karl Marx, April 11, 1851 | Friedrich Engels | 1851 |
| | Letter to Karl Marx, April 11, 1859 | Friedrich Engels | 1859 |
| | Letter to Karl Marx, April 12, 1865 | Friedrich Engels | 1865 |
| | Letter to Karl Marx, April 13, 1866 | Karl Marx | 1866 |
| | Letter to Karl Marx, April 13, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, April 14, 1856 | Friedrich Engels | 1856 |
| | Letter to Karl Marx, April 14, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 15, 1851 | Friedrich Engels | 1851 |
| | Letter to Karl Marx, April 15, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, April 16, 1865 | Friedrich Engels | 1865 |
| | Letter to Karl Marx, April 16, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 17, 1868 | Friedrich Engels | 1868 |
| | Letter to Karl Marx, April 18, 1870 | Paul Lafargue | 1870 |
| | Letter to Karl Marx, April 19, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 19, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, April 2, 1857 | Friedrich Engels | 1857 |
| | Letter to Karl Marx, April 2, 1866 | Friedrich Engels | 1866 |
| | Letter to Karl Marx, April 2, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 20, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, April 20, 1854 | Friedrich Engels | 1854 |
| | Letter to Karl Marx, April 20, 1868 | Friedrich Engels | 1868 |
| | Letter to Karl Marx, April 21, 1854 | Friedrich Engels | 1854 |
| | Letter to Karl Marx, April 21, 1863 | Friedrich Engels | 1863 |
| | Letter to Karl Marx, April 21, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, April 22, 1857 | Friedrich Engels | 1857 |
| | Letter to Karl Marx, April 22, 1858 | Friedrich Engels | 1858 |
| | Letter to Karl Marx, April 25, 1848 | Friedrich Engels | 1848 |
| | Letter to Karl Marx, April 25, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, April 25, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 26, 1853 | Friedrich Engels | 1853 |
| | Letter to Karl Marx, April 26, 1868 | Friedrich Engels | 1868 |
| | Letter to Karl Marx, April 27, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, April 27, 1853 | Friedrich Engels | 1853 |
| | Letter to Karl Marx, April 27, 1867 | Friedrich Engels | 1867 |
| | Letter to Karl Marx, April 29, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, April 29, 1864 | Friedrich Engels | 1864 |
| | Letter to Karl Marx, April 29, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, April 3, 1851 | Friedrich Engels | 1851 |
| | Letter to Karl Marx, April 3, 1854 | Friedrich Engels | 1854 |
| ∅ | Letter to Karl Marx, April 3, 1868 | Ferdinand Freiligrath | 1868 |
| | Letter to Karl Marx, April 30, 1858 | Friedrich Engels | 1858 |
| | Letter to Karl Marx, April 4, 1867 | Friedrich Engels | 1867 |
| | Letter to Karl Marx, April 4, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 6, 1866 | Friedrich Engels | 1866 |
| | Letter to Karl Marx, April 6, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 7, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, April 8, 1860 | Friedrich Engels | 1860 |
| | Letter to Karl Marx, April 8, 1863 | Friedrich Engels | 1863 |
| | Letter to Karl Marx, April 9, 1858 | Friedrich Engels | 1858 |
| | Letter to Karl Marx, August 1, 1860 | Friedrich Engels | 1860 |
| | Letter to Karl Marx, August 1, 1862 | Friedrich Engels | 1862 |
| | Letter to Karl Marx, August 10, 1841 | Jenny von Westphalen | 1841 |
| | Letter to Karl Marx, August 10, 1858 | Friedrich Engels | 1858 |
| | Letter to Karl Marx, August 10, 1859 | Friedrich Engels | 1859 |
| | Letter to Karl Marx, August 10, 1866 | Friedrich Engels | 1866 |
| | Letter to Karl Marx, August 10, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, August 10, 1881 | Friedrich Engels | 1881 |
| | Letter to Karl Marx, August 11, 1851 | Friedrich Engels | 1851 |
| | Letter to Karl Marx, August 11, 1867 | Friedrich Engels | 1867 |
| | Letter to Karl Marx, August 11, 1881 | Friedrich Engels | 1881 |
| | Letter to Karl Marx, August 12, 1837 | Heinrich Marx | 1837 |
| | Letter to Karl Marx, August 12, 1868 | Friedrich Engels | 1868 |
| | Letter to Karl Marx, August 12, 1869 | Friedrich Engels | 1869 |
| | Letter to Karl Marx, August 12, 1874 | Friedrich Engels | 1874 |
| | Letter to Karl Marx, August 13, 1862 | Friedrich Engels | 1862 |
| | Letter to Karl Marx, August 15, 1867 | Friedrich Engels | 1867 |
| | Letter to Karl Marx, August 15, 1870 | Friedrich Engels | 1870 |
| | Letter to Karl Marx, August 16, 1852 | Friedrich Engels | 1852 |
| | Letter to Karl Marx, August 16, 1865 | Friedrich Engels | 1865 |
| | Letter to Karl Marx, August 16, 1869 (1) | Friedrich Engels | 1869 |
