https://vocabularyserver.com/tgm1/ Thesaurus for Graphic Materials 1: Subject Terms Library of Congress. Prints and Photographs Division Graphic Materials, Subject Terms Library of Congress. Prints and Photographs Division 2007-07-04 en 2007-08-14 23:45:03 Hours of labor 2007-08-14 23:45:03 Eight-hour movement Hours of work Labor, Hours of Nine-hour movement Sunday labor Working hours https://vocabularyserver.com/tgm1/xml.php?skosTema=10795https://vocabularyserver.com/tgm1/xml.php?skosTema=7060https://vocabularyserver.com/tgm1/xml.php?skosTema=8826https://vocabularyserver.com/tgm1/xml.php?skosTema=3576https://vocabularyserver.com/tgm1/xml.php?skosTema=8452