Commons, John R. creator text nyu New York Macmillan 1921 monographic eng preservation access xii, 425 p. : ill. ; 24 cm. by John R. Commons, Willis Wisler, Alfred P. Haake, O.F. Carpenter, Jennie McMullin Turner ... [et al.]. Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010. MiAaHDL Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212 MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL Industrial efficiency HF5549 .C7 331.15 COI OCLCE 100507 20160524111416.0 8441844 eng