Reddit mentions of Northern California Atlas & Gazetteer

If you are interested in camping, hiking, or other outdoor activities, this book is a fantastic resource. The whole of Northern California in topographical maps that show roads, distances, hiking trails, camping, boating etc, the book includes lists of recreational facilities and campgrounds, with phone numbers and lists of amenities. I’m a big fan of paper maps, you can draw your path and keep track of your trip. This book is more than maps, if you do want to camp, it will help you find the different types of campgrounds - private, state run, federal, etc and their pricing. You may need reservations at certain places, so call ahead or check them out online.

Hope you have a great time! Love your itinerary! Keep us posted! :).