Chatty, D.

group tribe camel nomadism nomads population animal desert authority society factor sheep pasture arabia culture structure system nomad water organization development region adaption people condition problem segment sheikh environment process place family pressure state hiddle settlement country movement village section modification service force middle control change journal example saudi arabia government drought sedentarization pastoralism pattern migration source economy vegetation mechanism project territory pastoralist increase season point lineage principle response figure community syria right saudi effect balance number religion camping agriculture resource