Title: Preliminary report concerning explorations and surveys, principally in Nevada and Arizona
Subtitle: prosecuted in accordance with paragraph 2, special orders no. 109, War Department, March 18, 1871, and letter of instructions of March 23, 1871, from Brigadier General A.A. Humphreys, Chief of Engineers
Subjects: Description and travel, Discovery and exploration, Exploring expeditions
Places: Nevada, Arizona, United States, West (U.S.)