Fred Beckey seems to be cramming multiple lives into one. It's not enough for him that he has more first ascents than any other American, he's also a prolific author. And still going strong at 85!
Beckey's contributions to the climbing community are enshrined in his three-volume manifesto, Cascade Alpine Guide: Climbing & High Routes. Volume One covered Columbia River to Stevens Pass, Volume Two Stevens Pass to Rainy Pass, and now an updated 3rd Edition of Volume Three, Rainy Pass to Fraser River. Don't expect florid prose; Beckey's writing style makes Hemingway seem vulgarly verbose. Expect straight-ahead information transfer, and lots of it.
The area covers the coast to the Okanogan River and includes Mts. Shuksan, Baker, and Liberty Bell as well as the Twin Sisters, Cathedral Peak and many others. There is discussion of geology, history and climbing ethics. Maps are plentiful and clear, and route photos are presented from multiple angles with exhaustive coverage of variations. For the low-down on the high-up, Beckey sets the standard.