text Newspapers. fast (OCoLC)fst01423814 Denver, Colo. : United Labor Print. and Pub. , 1915-. eng Labor--Colorado--Newspapers. Labor unions--Colorado--Newspapers. Labor. Labor unions. Denver (Colo.)--Newspapers. Colorado--Denver. Colorado. United States Denver Denver. Available on microfilm from the Colorado Historical Society. Archived issues are available in digital format from the Library of Congress Chronicling America online collection. Denver labor bulletin United labor bulletin