[54] Loc. cit., p. 771.
[55] Van Hise, Charles R., Coöperation in industry, pp. 7-8, Address given before annual meeting of the National Lumber Manufacturers' Association, Chicago, Illinois, May 31, 1916.
[56] Loc. cit., p. 767.
[57] Stabilization of the bituminous coal industry, Extracts from the award and recommendations of the United States Bituminous Coal Commission, Government Printing Office, Washington, 1920.