00278nam a2200109Ia 450000500170000000800410001708200160005810000200007424500280009426000380012230000080016020260224040819.0260224s9999||||xx |||||||||||||| ||und||  a631.091 THO  aThomas, D.S.G.  0aArid zone geomorphology  aNew York: John Wiley & Sonsc1989  a372