TY  - SER
AU  - Willoughby, Arthur A.
TI  - Safety, sanitation, and welfare in the United States Steel Corporation exhibit
T2  - Mining press ; 
PY  - 1915///
CY  - San Francisco-XXU : 
PB  - The Scientific Press, 
KW  - MINERALES
KW  - PRODUCCION MINERA
KW  - MINERIA
N1  - Contiene: Bureau operations.- Statistics.- Accident prevention.- Welfare and sanitation work.- Distict nurses
ER  -