Unwin, Harry D. and George A. McBride. "Treatment of Wastes in a Metalworking Plant." Sewage Works Journal 21/3 (May 1949): 501-511.

Unwin, Harry D. and George A. McBride. "Treatment of Wastes in a Metalworking Plant." Sewage Works Journal 21/3 (May 1949): 501-511.