http://medherb.com/Materia_Medica/The_Mineral_Content_of_Herbal_Decoctions_.htm
Nutritional Herbology Pedersen
Healing Wise Susun Weed
http://www.ryandrum.com/seaweeds.htm
http://medherb.com/Materia_Medica/The_Mineral_Content_of_Herbal_Decoctions_.htm