See if you can get your hands on a copy of Western Whitewater. Though it's out of print and a bit dated, it's still really a great book for rafting whereas the Bible and New Testament were written more for kayakers. While it doesn't have the number of runs other guidebooks have, has most raftable runs and has very detailed descriptions of many rapids, access, and a number of other types of data.
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse