Routes and Rocks: Hikers Guide to the North Cascades from Glacier Peak to Lake Chelan was first published in 1965 by the Seattle Mountaineers, Seattle, Washington.
After many printings, the guide went out of print around 1971. The guide was developed and written under the auspices of the U.S. Gelogical Survey following U.S.G.S. geological field mapping in the Glacier Peak, Holden, and Lucerne 1:62,500-scale quadrangles. The pdf version offered here was scanned by Stanford University Libraries. R.W. Tabor made some minor changes to the pdf file.
The information in this guide is considerably out of date. Trailhead information, in particular, should be treated with caution. Some trails have been relocated. Users should apply route-finding skills even on trails.
Much of the geology overview is even more obsolete, although most descriptions of local geology are still valid.
For an up-to-date overview of North Cascade Geology see:
Geology of the North Cascades: a Mountain Mosaic, a non-technical explanation of North Cascade geology..
Routes and Rocks as pdf - without topo maps (12.4 MB)
Routes and Rocks as pdf - topo map - Glacier Peak (8.9 MB)
Routes and Rocks as pdf - topo map - Holden (2.7 MB)
Routes and Rocks as pdf - topo map - Lucerne (2.7 MB)