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1
Salt resources of the United States, by W.C. Phalen. [U.S. Geological Survey Bulletin 669.]
Published 1918Online Access
Government Document Electronic eBook -
2
Contributions to economic geology, 1904, by S.F. Emmons, C.W. Hayes, geologists in charge. [U.S. Geological Survey Bulletin No. 260. Series A, Economic Geology, 53.]
Published 1905Online Access
Government Document Electronic eBook -
3
Contributions to economic geology, 1902, [by] S.F. Emmons [and] C.W. Hayes, geologists in charge. [U.S. Geological Survey Bulletin No. 213. Series A, Economic Geology, 24.]
Published 1903Online Access
Government Document Electronic eBook