- E-bookSouthwest Treasure Hunter's Gem and Mineral Guide (6th Edition)Kathy J. Rygle
- E-bookSoutheast Treasure Hunter's Gem & Mineral Guide (6th Edition)Kathy J. Rygle
- E-bookNortheast Treasure Hunter's Gem & Mineral Guide (5th Edition)Kathy J. Rygle
- E-bookNorthwest Treasure Hunter's Gem and Mineral Guide (6th Edition)Kathy J. Rygle
- E-bookSouthwest Treasure Hunter's Gem and Mineral Guide (5th ed.)Kathy J. Rygle
- E-bookNorthwest Treasure Hunter's Gem and Mineral Guide (5th Edition)Kathy J. Rygle
- E-bookNortheast Treasure Hunter's Gem and Mineral Guide (6th Edition)Kathy J. Rygle
- E-bookSoutheast Treasure Hunter's Gem & Mineral Guide (5th Edition)Kathy J. Rygle