{"id":"000027000","type":"book","title":"Vegetational change along altitudinal gradients : studies in Ethiopia show that discreteness of zonation varies with steppness of slope. - Washington, D.C","container-title":"Science ; 165.1969, no. 3897, S. 981-985 : zahlr. Ill","author":[{"family":"Beals","given":"Edward W."}],"issued":{"raw":"1969"}}