My recommendations in travel books to use for planning your travels
This is my favorite book on the list, as this gives you great details of all of the National Parks in the states, with guides on getting to the areas and detailed information about the trails, how crowded or secluded an area may be and so much more useful information.
Local State Parks are sometimes overlooked for the more popular National Parks, but this book gives you a lot of great information on what's available in the particular state you may be interested in visiting. It's also useful for your own home state and finding hidden gems you may not have known about.
If you're into finding the best roadways to travel for your road trip then this book will be suited for you. Many of the routes I've traveled have been from reading this book and has been very helpful for the trips where I'm with my older family members, who may can't hike on any trails, but would still love to see beautiful sights from the car.