FYI, some very important books, now out of print and hard to find even in libraries, are online at http://journeytoforever.org/farm_library.html. Resources include "Soil and Health" by Albert Howard, "Conquest of the Land Through 7,000 Years" by W.C. Lowdermilk," and "Trees and Toadstools," by M.C. Rayner, the seminal work on mycorrhizae. Margaret L