Wheeler survey map of eastern California and Western Nevada, Atlas sheets 40 7B and 40 7D, by Wheeler, U.S. Army, under the direction of Brig. Gen. A Humphreys, chief of engineers, US Army based on the expeditions of 1876 and 1877. 1 inch equals 4 miles, folded in several places, cloth backed. 34 inches tall 22 1/4 inches wide. This important map is essentially the first regional survey of the area extending from approximately 39? latitude north to 40 to 50 N. to 40? 40 minutes latitude, otherwise commonly the southern edge of Lake Tahoe North well past Honey Lake. The map shows all of the old and new routes including the old Overland Road, in and out of the Comstock, shows the central Pacific railroad and the Virginia and Truckee railroad routes and all the small communities throughout this entire map region. Rare, some foxing. California