00427nam a2200157Ia 4500 338.20973 B251.MI Barger, Harold and Schurr, S. H. Mining industries, 1899, 1939; a study of output employment and productivity New York NBER 1944 xxii, 452p. Schurr, S. H. ; jt. auth. 0 0 0 0 ISI ISI 1998-09-28 0 338.20973 B251.MI DP7057 2019-02-14 00:00:00 2019-02-14 BK 14753 14753 14753