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The sand and gravel safety contest of 1929

Coal-Mine Fatalities in the United States, 1928

Metal-Mine Accidents in the United States During the Calendar Year 1928

Quarry Accidents in the United States During the Calendar Year 1928

The National safety competition of 1930

Production of explosives in the United States during the calendar year 1930

Coke-oven accidents in the United States :during the calendar year 1930

Accidents at metallurgical works in the United States :during the calendar year 1929

Sand-and-gravel safety contest of 1930

Coal-Mine Fatalities in the United States, 1929

Metal-Mine Accidents in the United States During the Calendar Year 1929

Quarry Accidents in the United States During the Calendar Year 1929

The National safety competition of 1931

Sand-and-gravel safety contest of 1931

Coke-oven accidents in the United States during the calendar year 1931

Accidents at metallurgical works in the United States :during the calendar year 1930

Production of explosives in the United States :during the calendar year 1931

Metal-Mine Accidents in the United States During the Calendar Year 1930

Quarry Accidents in the United States During the Calendar Year 1930

Accidents at metallurgical works in the United States :during the calendar year 1931

The National safety competition of 1932

Coke-oven accidents in the United States :during the calendar year 1932

Coal-Mine Accidents in the United States: 1931

Metal-Mine Accidents in the United States During the Calendar Year 1931

Quarry Accidents in the United States During the Calendar Year 1931

Accidents at metallurgical works in the United States during the calendar year 1932

Metal-Mine Accidents in the United States During the Calendar Year 1932

Quarry Accidents in the United States During the Calendar Year 1932

Coke-oven accidents in the United States during the calendar year 1933

Quarry Accidents in the United States During the Calendar Year 1933

The National safety competition of 1935

Production of explosives in the United States during the calendar year 1935

Metal-Mine Accidents in the United States During the Calendar Years: 1933-34

Quarry Accidents in the United States During the Calendar Year 1934

Production of explosives in the United States during the calendar year 1936

The national safety competition of 1936

Quarry Accidents in the United States During the Calendar Year 1935

Production of explosives in the United States during the calendar year 1937

National safety competition of 1937

Quarry Accidents in the United States During the Calendar Year 1936

National safety competition of 1938


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