| Call number | Item |
| H | Social Sciences (Go to start of category) |
| HX | Socialism, Communism, Utopias, Anarchism (Go to start of category) |
| HX1 .P57 | ![[Info]](https://onlinebooks.library.upenn.edu/info.gif) The Communist (successor of Workers Monthly and predecessor of Political Affairs; 1927-1944) (partial serial archives) |
| HX1 .P57 | The Labor Herald (Chicago: Trade Union Educational League, 1922-1924), by Trade Union Educational League (U.S.) (full serial archives) |
| HX1 .P57 | Political Affairs (ca. 2004-present; issue browsing appears no longer available but articles can be found via search) (partial serial archives) |
| HX1 .P57 | The Workers Monthly (full serial archives) |
| HX1 .P96 | Problems of Communism (US government-issued periodical) (partial serial archives) |
| HX1 .R483 | Revolutionary Marxist Caucus Newsletter (full serial archives) |
| HX1 .R484 | Revolutionary Communist Youth Newsletter (full serial archives) |
| HX1 .R55 | Revolutionary Age (Socialist Party Left Wing publication, 1918-1919) |
| HX1 .R5614 | Revolutionary Age (partial serial archives) |
| HX1 .R562 | Workers Age (partial serial archives) |
| HX1 .S165 | Socialism and Liberation (partial serial archives) |
| HX1 .S23 | The Socialist (partial serial archives) |
| HX1 .S4 | The Socialist Spirit (1901-1903) (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 | 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 .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) |