Relief shown by shading and spot heights. "Map II, west half; map II, east half." "Topographical field and office work was executed, under the direction of Geologist-in-charge [S.F. Emmons and Arnold Hague], by Jas. T. Gardner, Asst. in charge of geodesy, A.D. Wilson, F.A. Clark and H. Custer, topographers; hill drawing by F. von Leicht ... -- Legend [part of preface to atlas].