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Report of a geological reconnaissance in California: made in connection with the expedition to survey routes in California, to connect with the surveys of routes for a railroad from the Mississippi river to the Pacific Ocean, under the command of Lieut. R.S. Williamson, Corps Top. Eng'rs, in 1853. By William P. Blake ... With an appendix containing descriptions of portions of the collection, by Prof. Louis Agassiz, Aug. A. Gould, M.D., Prof. J.W. Bailey, T.A. Conrad, Prof. John Torrey, Prof. Geo. C. Schaeffer, J.D. Easter, PH. D.

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