Books by R. R. Wells:
Books in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Wells, R. R. (Rollien Raymond): Beneficiation of oxide and carbonate manganese ores from the Philipsburg District, Granite County, Mont. (U.S. Dept. of the Interior, Bureau of Mines, 1947), also by K. C. Vincent and A. O. Ipsen (page images at HathiTrust)- Wells, R. R. (Rollien Raymond): Concentration of Colorado fluorite ores (U.S. Dept. of the Interior, Bureau of Mines, 1947), also by J. V. Batty and R. Havens (page images at HathiTrust)
- Wells, R. R. (Rollien Raymond): Concentration of oxide manganese ore from Sheep Mountain property, Durkee district, Oreg. (U.S. Dept. of the Interior, Bureau of Mines, 1947), also by W. W. Agey (page images at HathiTrust)
- Wells, R. R. (Rollien Raymond): Concentration of oxide manganese ores from the Havasu Lake District, California and Arizona (U.S. Dept. of the Interior, Bureau of Mines, 1947), also by W. W. Agey, George M. Potter, and Richard Havens (page images at HathiTrust)
Find more by R. R. Wells at your library, or elsewhere.