The primary source is the official manuscript returns in the 1898-1918 poll book, located at the Nevada State Archives in Carson City. The returns were also printed in 1909-1910 Biennial Report of the Secretary of State.
Source for Popular Vote data: Nevada State Archives, "State Treasurer," Election Returns of General Election held on the 8th day of November A.D. 1910 (Carson City, 1910)