Books by L. D. Tracy:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Tracy, L. D. (Louis Downer): Coal-mine royalties and leasing conditions in Macoupin, Sangamon, and Montgomery counties, District VII, Illinois (U.S. Dept. of Commerce, Bureau of Mines, 1926), also by United States Bureau of Mines (page images at HathiTrust)- Tracy, L. D. (Louis Downer): Coal-mining royalties and leasing conditions in Vermilion and Edgar counties, Illinois (District VIII) (U.S. Dept. of Commerce, Bureau of Mines, 1926), also by United States Bureau of Mines (page images at HathiTrust)
- Tracy, L. D. (Louis Downer): Coal-mining royalties and leasing conditions in Williamson and Franklin counties, Illinois (District no. VI) (U.S. Dept. of Commerce, Bureau of Mines, 1926), also by United States Bureau of Mines (page images at HathiTrust)
- Tracy, L. D. (Louis Downer): Explosion hazards incidental to unwatering coal mines (Washington, D.C. : United States Department of the Interior, Bureau of Mines, 1924., 1924), also by United States Bureau of Mines (page images at HathiTrust)
- Tracy, L. D. (Louis Downer): Pulverized coal hazards at industrial plants (U.S. Dept. of the Interior, Bureau of Mines, 1921), also by United States Bureau of Mines (page images at HathiTrust)
- Tracy, L. D. (Louis Downer): Small hose streams for fighting mine fires (U.S. Dept. of the Interior, Bureau of Mines :, 1925), also by Rae Wright Hendricks, University of Illinois (Urbana-Champaign campus). Engineering Experiment Station, Illinois State Geological Survey, and United States Bureau of Mines (page images at HathiTrust)
Find more by L. D. Tracy at your library, or elsewhere.