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Notes on the geology of the survey for the extension of the Union Pacific railway, E. D., from the Smoky Hill river, Kansas, to the Rio Grande.

By Le Conte, John Lawrence,.
Philadelphia [Review printing house] 1868 .
76 p. , "Catalogue of rocks, by Dr. F. A. Genth": p. 69-76. 23 cm..

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Preliminary report on the mineralogy of Pennsylvania,

By Genth, F. A..
Harrisburg, Pub. by the Board of commissioners for the Second Geological survey, 1875 .
2 p.l., B v, 206 B p. , At head of title: Second geological survey of Pennsylvania, 1874. 23 cm..

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Researches on the ammonia-cobalt bases.

By Gibbs, Wolcott,.
[Washington, Smithsonian Institution, 1856 .
iv, 67, [1] p. 33 cm..

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