National geographic
Okanogan County heritage
History notes
Polk city directory
The orchardist by Coplin, Amanda
Border songs by Lynch, Jim
East of the mountains by Guterson, David
Unsettled ground by Tate, Cassandra
Original journals of the Lewis and Clark Expedition, 1804-1806 by Lewis, Meriwether
Backpacking Washington : overnight and multiday routes by Romano, Craig
The Oregon Trail by Buck, Rinker
Ancient places by Nisbet, Jack
A history of central Washington by Hull, Lindley M
Day hiking : Snoqualmie region : cascade foothills/I-90 corridor/alpine lakes by Nelson, Dan A
Forgotten trails by Anglin, Ron
The Night the mountain fell, and other stories of north central Washington history
Late frontier by Wilson, Bruce A
Ferryboats on the Columbia River, including the bridges and dams by Ruby, Robert H
Pioneers of North Central Washington by Anderson, Eva Greenslit
The secret history of Twin Peaks by Frost, Mark
Native river by Layman, William D
Fishes of the Columbia Basin by Dauble, Dennis D
A view of the Methow from Moccasin Lake Ranch by Pigott, James C
Day Hikes in the Pacific Northwest: 90 Favorite Trails, Loops, and Summit Scrambles Within a Few Hours of Portland and Seattle by Scarmuzzi, Don J

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