Books by John G. Parker:
![[Info]](https://onlinebooks.library.upenn.edu/info.gif)
Parker, John G.: Relationship of Density to Composition in the Columbite-Tantalite Series (report of investigations 5150; Washington: U.S. Dept. of the Interior, Bureau of Mines, 1955), also by William Joseph Campbell (page images at HathiTrust)
Additional books by John G. Parker in the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Parker, John G.: Conversion tables for fluorescent x-ray spectroscopy (Dept. of the Interior, Bureau of Mines, 1955), also by William Joseph Campbell and United States Bureau of Mines (page images at HathiTrust)- Parker, John G.: Occurrence and recovery of certain minor metals in the processing of lead and zinc (Dept. of the Interior, Bureau of Mines :, 1979), also by United States Bureau of Mines (page images at HathiTrust)
- Parker, John G.: Occurrence and recovery of certain minor metals in the smelting-refining of copper (Dept. of the Interior, Bureau of Mines :, 1978), also by United States Bureau of Mines (page images at HathiTrust)
Find more by John G. Parker at your library, or elsewhere.