TY  - BOOK
TI  - Coal miners; pocketbook: Principles, rules, formulas and tables
AV  - TN151 Z45 1916
PY  - 1916///
CY  - New York, London
PB  - McGraw-Hill, Hill
KW  - Minas de carbón
KW  - Ingeniería de minas
KW  - Manuales, etc
N1  - Publicado previamente como; formely the coal and metal miners' pocketbook
ER  -