Three letters from Alexander Agassiz to the Hon. Marshall McDonald ... on the dredging operations off the west coast of Central America to the Galapagos, to the west coast of Mexico, and in the Gulf of California, in charge of Alexander Agassiz, carried on by the U.S. Fish Commission steamer "Albatross," Lieut. Commander Z. L. Tanner, U.S.N. commanding

by Alexander Agassiz , Marshall McDonald , Zera Luther Tanner