Healing Crystals and Gemstones by: Dr. Flora Peschek-Bohmer and Gisela Schreiber.
A great reference guide for most crystals and gemstones in alphabetical order. Look up the gemstones, their healing properties, physical properties, history, magical properties, chakra classification and more! One of the best references I have found!
A Druid's Herbal For the Sacred Earth Year by: Ellen Evert Hopman.
An informative written work that details different uses and meanings for a variety of herbs. This reference guide also gives not only the herbal uses but the magical uses of various herbs. I have found this to be a truly useful reference guide on the subject of herbs and their applications.