On this edition of Conversations, Joe Yogerst talks with host Dan Skinner about “50 States 500 Campgrounds: Where to Go, When to Go, What to See, What to Do.” Yogerst is an editor, writer, and photographer, who has contributed to more than 40 National Geographic books, including the best-selling “50 States, 5,000 Ideas;” “100 Drives, 5,000 Ideas;” and “100 Parks, 5,000 Ideas.”