Coal-mine injuries and worktime.
APA Citation
United States. Bureau of Mines., United States. Mining Enforcement and Safety Administration. Coal-mine injuries and worktime. Washington: U.S. Dept. of the Interior, Mining Enforcement and Safety Administration.
MLA Citation
United States. Bureau of Mines, and United States. Mining Enforcement and Safety Administration. Coal-mine Injuries And Worktime. Washington: U.S. Dept. of the Interior, Mining Enforcement and Safety Administration,
Warning: These citations may not always be complete (especially for serials).