Online Books by
Roy Austin Ritchey
Books from the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Ritchey, Roy Austin: Field test for beryllium (U. S. Department of Interior, Bureau of Mines, 1960), also by W. M. Dressel and United States Bureau of Mines (page images at HathiTrust)- Ritchey, Roy Austin: Recovery of chromite and silica from steel foundry waste molding sands (U.S. Dept. of the Interior, Bureau of Mines, 1971), also by P. G. Barnard, H. Kenworthy, United States. Bureau of Mines. Solid Waste Research Program, and Rolla Rolla Metallurgy Research Center (page images at HathiTrust)
- Ritchey, Roy Austin: Separation of feldspar, quartz, and mica from granite (U.S. Dept. of the Interior, Bureau of Mines, 1969), also by J. A. Gerard, H. Kenworthy, Thomas E. Hill, and United States Bureau of Mines (page images at HathiTrust)
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