The search for skulls : mortuary behaviour of the ancient Near East ( 12500-7000 cal. BC) / Arne WossinkChallenging climate change : competition and cooperation among pastoralists and agriculturalists in northern Mesopotamia (c. 3000-1600 BC) / Arne WossinkChallenging climate change : competition and cooperation among pastoralists and agriculturalists in northern Mesopotamia (c.3000-1600 BC) / A. WossinkChallenging climate change : competition and cooperation among pastoralists and agriculturalists in northern Mesopotamia (c. 3000-1600 BC) / Arne Wossink