Author
Delaware River Port Authority
2
U.S Board of Engineers for Rivers and Harbors
2
Martin, Alfred Simpson
1
Philadelphia Chamber of Commerce
1
Ralston, Robert, 1761-1836
1
U.S Maritime Commission
1
U.S Shipping Board
1
United States. Army. Corps of Engineers
1
United States. Board of Engineers for Rivers and Harbors
1
United States. Congress
1
United States. Maritime Administration
1
United States. Maritime Commission
1