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The sand and gravel safety contest of 1929

Sand-and-gravel safety contest of 1930

Sand-and-gravel safety contest of 1931

Published Year

• 1930-1939 (3) *

Subject

• Industrial safety (3)
• Sand and gravel industry--Accidents (3)
• Sand and gravel mines and mining--Accidents (3) *

Author

• Adams, William W. (3)

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