Nevada Maps
The libraries of the University of Nevada—Reno and the University of Nevada—Las Vegas have large collections of maps and atlases. The Nevada State Library and Archives also has a good map collection.
Maps of the Nevada area in 1862, 1878, 1884, and 1917 are on FHL film 002083. The Family History Library has a small collection of individual maps.
Online Resources
http://www.delamare.unr.edu/maps/digitalcollections/nvhistory/
More recent Maps can be found at:
http://maps.google.com/maps?tab=wl
http://www.multimap.com/index/US30.htm
You can also search for additional maps by using a search engine and terms such as Nevada (or your specific location) and Maps.