Report upon United States Geographical surveys west of the one hundredth meridian
A. A. Humphreys, chief of engineers until June 1879. Succeeded by H. G. Wright 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 survye of an area of an area of peculiar interest," and also maps, based on the maps of the Topographical atlas and known as the "Land classification series."
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