1. Geologic map of the Glacier Peak quadrangle, Snohomish and Chelan Counties, Washington [cartographic material] Yale Public content 1966. 2011-12-20T18:59:49Z. 2012-03-05T17:26:42Z. Crowder, D. F. (Dwight Farnsworth), 1929-. The Survey. English. Public. Washington (State), Snohomish County, and Chelan County.