{"id":"000030244","type":"book","title":"Speculations on the interrelations of the history of tools and biological evolution. - Detroit, MI","container-title":"Human biology ; 31.1959, no. 1, S. 21-31 : 3 Ill. ; 1 Tab","author":[{"family":"Washburn","given":"Sherwood L."}],"issued":{"raw":"1959"}}