Bridge across the Allegheny River at Emlenton, Pa.

MLA

United States. Bridge across the Allegheny River at Emlenton, Pa. Washington : [publisher not identified], 1935.

APA

United States. (1935). Bridge across the Allegheny River at Emlenton, Pa. Washington : [publisher not identified].

Chicago

United States. Bridge across the Allegheny River at Emlenton, Pa. Washington : [publisher not identified], 1935.