doi:10.7916/d8-95k7-p946Letter from the Secretary of War transmitting, with a letter from the Chief of Engineers, reports of examination and survey of Buttermilk Channel, New York HarborRoot, Elihu, 1845-1937bookstextChannels (Hydraulic engineering)--Upper Bay (N.Y. and N.J.)Upper Bay (N.Y. and N.J.)--Channelization.Buttermilk Channel (New York, N.Y.)New York Harbor (N.Y. and N.J.)