1. Safety and health almanac for 1922 Author(s): Williams, Ralph C. (Ralph Chester), 1888-1984 compiler Publication: Washington : Government Printing Office, 1921 Subject(s): Occupational Diseases -- prevention & controlMiningOccupational HealthUnited States
2. Miners' safety and health almanac for 1920 Author(s): Williams, Ralph C. (Ralph Chester), 1888-1984 compiler Publication: Washington : Government Printing Office, 1919 Subject(s): Occupational Diseases -- prevention & controlMiningOccupational HealthUnited States
3. Miners' safety and health almanac for 1919 Author(s): Williams, Ralph C. (Ralph Chester), 1888-1984 compiler Publication: Washington : Government Printing Office, 1918 Subject(s): Occupational Diseases -- prevention & controlMiningOccupational HealthUnited States
