Lewis W. Hine
Originally from the collection of Allen H. Eaton, a trustee of New York's Ethical Culture School, and an employee of the Russell Sage Foundation, where Hine had an important exhibition of his photographs in 1929
Lewis Hine,
Men at Work: Photographic Studies of Modern Men and Machines (New York, 1977), unpaginated
Freddy Langer, The Empire State Building (Munich, 1998), p. 51