Cascade Alpine Guide, Vol 3: Rainy Pass to Fraser RIver
Author Fred Beckey Published The Mountaineers
Review Beckey's guidebooks are definitive, authoritative and comprehensive. However, he is the king of the sandbaggers.
Might be better to try SELECTED CLIMBS IN THE CASCADES VOL 1, and VOL 2 by Jim Nelson and edited by Peter Potterfield