1934- 1942- alcock arizona arizonasonorandesertorganisms biography biologists cattle christianity classification corbett descriptionandtravel desertecology desertification desertplants ecology effectofhumanbeingson environmentalconditions etc ethnozoology geographicaldistribution glossaries goats herders indigenouspeoples jim john maps mollusks name naturalhistory nature phytogeography quakers religiousaspects sanctuarymovement science seriindians serilanguage simplicity socialaspects spirituallife spring tohonoo'odhamindians unitedstates vocabularies wilderness(theology)