Hine, Lewis - The National Child Labor Committee Collection (Library of Congress Special Collections). - http://www.loc.gov/rr/print/coll/207-b.html
Lewis Wickes Hine's Work Portraits - Lewis Wickes Hine's self described "work portraits" series began shortly after World War I. In this work, he chose to glorify the inextricable communion between the worker and the machine. - http://www.nypl.org/research/chss/spe/art/photo/hinex/workport/work1.html
Hine, Lewis Wickes: Empire State Building - Lewis Hine was commissioned to photograph the construction of the building in 1930. This page of the New York Public Library presents a selection of the resulting photographs. - http://www.nypl.org/research/chss/spe/art/photo/hinex/empire/empire.html