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On the classification of rocks
Vol 5, Iss 13, Page 275, Date 1879
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Letter no. 3 to Carlile P. Patterson, Superintendent United States Coast Survey, Washington, D. C., from Alexander Agassiz, on the dredging operations carried on from December, 1878, to March 10, 1879, by the United States Coast Survey steamer "Blake," Commander J. R. Bartlett, U. S. N.
Vol 5, Iss 14, Page 289, Date 1879