Bouldering Guide to the Castle Rock Area
Bruce Morris, 2002. MorComm Press
An update to Bruce's A climber's guide to Skyline Boulevard. This book contains a ton of updated information mostly consisting of bouldering in and around the Castle Rock State Park area, but also some updates to climbing rocks and routes from his book. This is a shorter guide, so if there is a debate between his two books, get the climbing guide unless you're a boulderer. The book is still recommended though!
Castle Rock & Sanborn-Skyline Parks