National Conference on City Planning (21st : Buffalo and Niagara Falls, N.Y.). (1929). Planning problems of town, city and region: Papers and discussions at the twenty-first National Conference on City Planning, held at Buffalo and Niagara Falls, New York, May 20 to 23, 1929. W.F. Fell for the Conference.

National Conference on City Planning (21st : Buffalo and Niagara Falls, N.Y.). Planning Problems of Town, City and Region: Papers and Discussions at the Twenty-first National Conference on City Planning, Held at Buffalo and Niagara Falls, New York, May 20 to 23, 1929. Philadelphia: W.F. Fell for the Conference, 1929.

National Conference on City Planning (21st : Buffalo and Niagara Falls, N.Y.). Planning Problems of Town, City and Region: Papers and Discussions at the Twenty-first National Conference on City Planning, Held at Buffalo and Niagara Falls, New York, May 20 to 23, 1929. W.F. Fell for the Conference, 1929.