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Find North Cascades geologic maps Mount Baker Sauk River Skykomish River Snoqualmie Pass Robinson Mountain Twisp Chelan Wenatchee

Geologic Map of the Chelan 1:100,000 scale quadrangle, I-1661 published in 1987; digital version 2001 Link to downloadable PDF file and database of the geologic map, correlation of units, cross section(s) and description of the map units (8.4 MB) and/or PDF file of the pamphlet, illustrations and tables (2.7 MB).

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