Online Books by
Robert G. Clarke
Books from the extended shelves:
![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif)
Clarke, Robert G.: Impact of changing technology on refractories consumption (U.S. Bureau of Mines; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.], 1970), also by David J. Kusler (page images at HathiTrust)- Clarke, Robert G.: Mineral facts and problems, preprint (United States Government Printing Office, 1976), also by United States Bureau of Mines (page images at HathiTrust)
- Clarke, Robert G.: Mineral facts and problems, preprint (United States Government Printing Office, 1976), also by United States Bureau of Mines (page images at HathiTrust)
- Clarke, Robert G.: Mineral facts and problems, preprint (United States Government Printing Office, 1976), also by United States Bureau of Mines (page images at HathiTrust)
- Clarke, Robert G.: Mineral facts and problems, preprint (United States Government Printing Office, 1976), also by United States Bureau of Mines (page images at HathiTrust; US access only)
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