| title | creator | language | description | tableOfContents | contributor | subject | created |
| Feuerbach: The roots of the socialist philosophy | Engels, Friedrich, 1820-1895 | en | | | Lewis, Austin [Translator] | Dialectical materialism; Feuerbach, Ludwig, 1804-1872; Socialism | 2009-01-15 |
| Landmarks of Scientific Socialism
"Anti-Duehring" | Engels, Friedrich, 1820-1895 | en | | | Lewis, Austin [Editor] | | 2010-04-09 |
| The Condition of the Working-Class in England in 1844
with a Preface written in 1892 | Engels, Friedrich, 1820-1895 | en | | | Kelley, Florence, 1859-1932 [Translator] | Working class -- Great Britain; Great Britain -- Economic conditions | 2005-12-13 |
| The Origin of the Family, Private Property and the State | Engels, Friedrich, 1820-1895 | en | | | Untermann, Ernest [Translator] | | 2010-07-08 |