Start with high-confidence parks & camping books, then narrow by subgenre or adjacent topics.
Subpar Parks
Amber Share
Exploring the Boundary Waters
Daniel Pauly
Fifty Places to Camp Before You Die
Chris Santella
Lodge
Max Humphrey, Kathryn O'Shea-Evans
100 Parks, 5,000 Ideas
National Geographic, Joe Yogerst
The Yellowstone Fly-fishing Guide, New and Revised
Craig Mathews, Clayton Molinero
Ultimate RV Guide to the Northeast
Keith Guise
Essential Yellowstone
Michael Yochim
Lonely Planet Banff, Jasper and Glacier National Parks 7 7th Ed.
Brendan Sainsbury, Jade Bremner
Lonely Planet Great Smoky Mountains National Park 3 3rd Ed.
Amy Balfour, Gregor Clark
Lonely Planet Utah's National Parks 6 6th Ed.
Lauren Keith
Leave Only Footprints
Conor Knighton