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Agassiz, A. E. 1880. (Letter No. 4.) To Carlile P. Patterson, Superintendent United States Coast and Geodetic Survey, Washington, D.C., from Alexander Agassiz, on the dredging operations carried on during part of June and July, 1880, by the United States Coast Survey Steamer "Blake," Commander J.R. Bartlett, U.S.N. Bulletin of the Museum of Comparative Zoology 6(8):147–154.