Author
Philadelphia Record
3
American Society of Civil Engineers. Philadelphia Section
1
Barker, George F. 1835-1910
1
Engineers Club of Philadelphia
1
Interstate Commission on the Delaware River Basin Conference
1
Ludlow, William, 1843-1901
1
Mears, John W. 1825-1881
1
Neeson, John Henry
1
Philadelphia Citizens
1
Philadelphia Councils Water Committee
1
Philadelphia County Medical Society
1
Turner, Ellwood Jackson, 1886-
1
Vaughan, H. B. 1888-
1
Wolman, Abel, 1892-
1
YA Pamphlet Collection (Library of Congress)
1