Frederick Law Olmsted, Jr

Photo Courtesy Carnegie Library of Pittsburgh

Two Workers,
Culvert, 1930

Photo Courtesy Carnegie Library of Pittsburgh

Unidentified Men,
Culvert, 1930

Photo Courtesy Carnegie Library of Pittsburgh

Jane Grey Swisshelm

Photo Courtesy Archives of Industrial Society, Frick Museum

Andrew Carnegie

Photo Courtesy Archives of Industrial Society, Frick Museum

Henry Clay Frick

Photo Courtesy Archives of Industrial Society, Frick Museum