Lewis W. Hine Collection
Rare Books and Manuscripts Division
The New York Public Library
Astor, Lenox and Tilden Foundations

Archives of Industrial Society
University Library Systems
University of Pittsburgh

Brown Brothers

Andrew Carnegie Birthplace Museum

The Museum of the City of New York

Pennsylvania Department, Carnegie Library of Pittsburgh

Department of Special Collections,
Van Pelt-Deitriech Library,
University of Pennsylvania

Boston Public Library

Library of Congress

Pennsylvania State Archives

Chicago Historical Society