A coolie laborer in  Zhenjiang, China, ca. 1900.

A coolie laborer in  Zhenjiang, China, ca. 1900.

Doris Ulmann, Laborer’s hands, ca. 1925.
Source: Library of Congress Prints and Photographs Division

Doris Ulmann, Laborer’s hands, ca. 1925.

Source: Library of Congress Prints and Photographs Division

John Vachon, Worker at a carbon black plant, Sunray, Texas, USA, 1942.
Source: Library of Congress

John Vachon, Worker at a carbon black plant, Sunray, Texas, USA, 1942.

Source: Library of Congress

A peasant field worker sleeping at midday during harvesting. Photograph by Paul Schutzer. Bulgaria, August 1963.

A peasant field worker sleeping at midday during harvesting. Photograph by Paul Schutzer. Bulgaria, August 1963.