It's a Treasure Hunt! Geocaching & Letterboxing
DK Readers: Boys' Life Series: Let's Go Geocaching
The Unofficial Field Manual to Geocaching
Cache Advance Dr. B's Geocaching Beginner Kit
Journals Unlimited "Write it Down!" Series Guided Journal, Write It Down, Geocaching, A Seek & Find Journal, Mini-Size 3"x5.5", with a Green Hard Cover, Made of Recycled Materials
Ben and the Geocache Treasure
The Complete Idiot's Guide to Geocaching, 3e