| http://www.w3.org/ns/prov#value | - rkers and shifts worked. digital.library.unt.edu/ark:/67531/metadc12444/ Metal-Mine Accidents in the United States During the Calendar Year 1925 Report issued by the U.S. Bureau of Mines covering accidents that happened in metal mines located in the United States including statistics for injuries, fatalities, kinds and causes of accidents, and operational data, such as number of mine workers and s
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