{"id":"000029311","type":"book","title":"Obsidian trade at San Lorenzo Tenochtitlan, Mexico : analysis of obsidian artifacts emphazises the role of trade in the rise of Olmec civilization. - Washington, D.C","container-title":"Science ; 174.1971, no. 4010, S. 666-671 : 3 Ill. ; 1 Kt. ; 3 Tab","author":[{"family":"Cobean","given":"Robert H."}],"issued":{"raw":"1971"}}