"id","author_first1","author_last1","title","year","type","university","place","keyword0","keyword1","keyword2","keyword3","keyword4","keyword5" "1132","Emil","Betzler","Sozialer Umbruch und Kulturlandschaftswandel in Südarabien. Agrargeographische Untersuchungen im Umland der jemenitischen Hauptstadt ana","1986","dissertation","Universität zu Köln","n.a.","Agriculture","Development","Glossary","Markets","Qat","Terms"