United States. Bureau of Mines. (1938). Mine Safety Board decision 28: Safety catches and arresting devices for cages, skips, and cars in mine shafts and slopes. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Mine Safety Board Decision 28: Safety Catches and Arresting Devices for Cages, Skips, and Cars in Mine Shafts and Slopes. [Washington]: [s.n.], 1938.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Mine Safety Board Decision 28: Safety Catches and Arresting Devices for Cages, Skips, and Cars in Mine Shafts and Slopes. [s.n.], 1938.
Warning: These citations may not always be 100% accurate.