Hi Ed,
I enjoyed flipping through each of these books on my foraging self-education, so you might too.
Most of these were available through my regional library.
In no specific order:
-Pacific Northwest Medicinal Plants: Identify, Harvest, and Use 120 Wild Herbs for Health and Wellness - by Scott Kloos
-Pacific Northwest Foraging: 120 Wild and Flavorful Edibles from Alaska Blueberries to Wild Hazelnuts - by Douglas Deur
-Medicinal Plants of the Pacific West - by Michael Moore
-Plants of the Pacific Northwest Coast: Washington, Oregon, British Columbia and Alaska - by Jim Pojar