Google had the intro chapter. Interesting viewpoint before factory farming and trucking in fertilizer came to play. Perhaps this old book will be a bell ringer for the next era after the oil farming economy. The Google intro doesn't have much germane to say about tree farming; but, the online version has the complete, original book (not the reprint with a forward and new publication data :-) http://www.soilandhealth.org/01aglibrary/010175.tree%20crops.pdf REading through that book reveals much good knowledge including importance of foraging trees and ideas on cultivating cultivars and on other trees which might could be used.