- E-bookThe Book of StonesRobert Simmons
- E-bookThe Pocket Book of StonesRobert Simmons
- E-bookThe Alchemy of StonesRobert Simmons
- E-bookStones of the New ConsciousnessRobert Simmons
- E-bookThe Book of MoldaviteRobert Simmons
- E-bookThe Other WithinDaniel Deardorff
- E-bookLibro de bolsillo de piedrasRobert Simmons