Cohen, M. M. (1886). The balance of power between industrial and intellectual work: Read at a meeting of the association, March 25th, 1886. Philadelphia: Philadelphia Social Science Association.

Cohen, Mary M. The Balance of Power between Industrial and Intellectual Work: Read At a Meeting of the Association, March 25th, 1886. Philadelphia: Philadelphia Social Science Association, 1886.

Cohen, Mary M. The Balance of Power between Industrial and Intellectual Work: Read At a Meeting of the Association, March 25th, 1886. Philadelphia: Philadelphia Social Science Association, 1886.