In addition to the atlases named, there are "special maps (not accompanying reports) ... issued from time to time to show the results of some preliminary reconnaissance or of some survey of an area of peculiar interest," and also maps, based on the maps of the Topographical atlas and known as the "Land classification series."

A.A. Humphreys, Chief of Engineers until June 1879; succeeded by H.G. Wright. Published by authority of the Secretary of War in accordance with acts of Congress of June 23, 1874, and February 15, 1875.