1. Progress map of the U.S. Geographical Surveys west of the 100th meridian. to accompany the annual report of 1st lieut. George M. Wheeler / 1877 Yale Public content 1877. 2002-06-01T04:00:00Z. 2017-07-04T21:13:53Z. Geographical Surveys West of the 100th Meridian (U.S.). Government Printing Office. English. Public. West (U.S.).