| Call number | Item |
| H | Social Sciences (Go to start of category) |
| HX | Socialism, Communism, Utopias, Anarchism (Go to start of category) |
| HX1 .S23 | ![[Info]](https://onlinebooks.library.upenn.edu/info.gif) The Socialist (partial serial archives) |
| HX1 .S24 | The Social Democrat (US, 1897-1898) (partial serial archives) |
| HX1 .S4 | The Socialist Spirit (1901-1903) (partial serial archives) |
| HX1 .S595 | Social Democratic Herald (Social Democratic Party of America-founded newspaper, 1898-1913) (partial serial archives) |
| HX1 .S6 | Socialist Worker, by International Socialist Organization (U.S.) (partial serial archives) |
| HX1 .S64 | Spartacist (partial serial archives) |
| HX1 .S6673 | Socialist Clarity (first and only known issue of a New York-based periodical, March 1937) (multiple formats at archive.org) |
| HX1 .S67 | The Social-Democrat (UK, 1897-1911) (partial serial archives) |
| HX1 .S67 | Socialist Call (partial serial archives) |
| HX1 .T6 | The Toiler (full serial archives) |
| HX1 .U6 | Upton Sinclair's: A Monthly Magazine, For a Clean Peace and the Internation (published 1 volume of 10 issues, 1918-1919), ed. by Upton Sinclair (full serial archives) |
| HX1 .W38 | The People, by Socialist Labor Party (partial serial archives) |
| HX1 .W38 | The Worker (New York, 1901-1908) (partial serial archives) |
| HX1 .W4 | Western Worker (Communist newspaper published in San Francisco in the 1930s), by Communist Party of the United States of America (partial serial archives) |
| HX1 .W46 | The Western Socialist (partial serial archives) |
| HX1 .W48 | The Western Comrade (full serial archives) |
| HX1 .W73 | Workers Challenge (United Toilers of America newspaper, 1922) (full serial archives) |
| HX1 .W731 | The Worker (Boston: Communist Party (Massachusetts), 1919-1920) (partial serial archives) |
| HX1 .W75 | The Workers' Council (full serial archives) |
| HX1 .W75 1921 | The Workers' Council (10 issues; 1921) (full serial archives) |
| HX1 .Y55 | Young Socialist (1957-1970s) (partial serial archives) |
| HX1 .Y57 | Young Spartacus (partial serial archives) |
| HX1 .Y6 | Young Worker (partial serial archives) |
| HX3 | Fight Racism! Fight Imperialism!, by Revolutionary Communist Group (Great Britain) (partial serial archives) |
| HX3 | Internationalist Communist (partial serial archives) |