John Ripley Freeman
Arthur Radclyffe Dugmore
Canal Zone. Department of Operation and Maintenance. Special Engineering Division
Harry Foot Hodges
United States. Congress. House. Committee on Public Works and Transportation.
Bertlin and Partners.
Jackson H. Ables
Louis J. Shows
Unknown Author
United States. Office of the Assistant Secretary of the Army (Civil Works)
W. Henry Hunter
John Kemplay
United States. Army. Corps of Engineers.
William Henry Hunter
United States. Congress. Senate. Committee on Environment and Public Works.
John Gagg
C. Kooman
Carlos Eduardo de Almeida
William Harley Weston