TY  - BOOK
AU  - Barger, Harold and Schurr, S. H.
AU  - Schurr, S. H. ; jt. auth.
TI  - Mining industries, 1899, 1939; a study of output employment and productivity
U1  - 338.20973 
PY  - 1944///
CY  - New York
PB  - NBER
ER  -