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Displaying 1-6 of 6 results for author "Tracy, L. D."
Explosion hazards from use of pulverized coal at industrial plants [microform]
- Text
- [Washington?] : U.S. G.P.O., 1925.
- 1925
Coal-mining royalties and leasing conditions in Williamson and Franklin Counties, Ill. (District No. VI) [microform]
- Text
- Washington, D.C. : [s.n.], 1926.
- 1926
Coal mining royalties and leasing conditions in Vermilion and Edgar counties, Ill. (District VIII) [microform]
- Text
- Washington, D.C. : [s.n.], 1926.
- 1926
Coal-mine royalties and leasing conditions in Macoupin, Sangamon, and Montgomery Counties, District VII, Illinois [microform]
- Text
- Washington, D.C. : [s.n.], 1926.
- 1926
Future timber supply for coal mines [microform] : what one company is doing
- Text
- Washington, D.C. : [s.n.], 1926.
- 1926
Known accumulation of gas ignited by unapproved rock-dusting machine [microform]
- Text
- Washington, D.C. : [s.n.], 1927.
- 1927
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