Book digitized by Google from the library of the New York Public Library and uploaded to the Internet Archive by user tpb.
At head of title: Department of the interior
A. Administration, by H. M. Frye.--B. Triangulation, comp. by E. M. Douglas.--C. Transit traverse, comp. by E. M. Douglas.--D. Levelling, comp. by E. M. Douglas.--E. Topographic mapping, by W. M. Beaman.--F. Map compilation from aerial photographs, by T. P. Pendleton