This article is within the scope of WikiProject Maps, a collaborative effort to improve the coverage of Maps and Cartography on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
I've flagged "Wilson resigned from the USGS on September 30, 1881, in order to become chief topographer for the Northern Transcontinental Survey, (...) to map the sprawling areas of Washington, Idaho, and Montana" with links to the state pages. The three states were formed in 1889 and 1890. I guess we could make that clear somehow here.--ospalh (talk) 10:12, 7 May 2010 (UTC)