{"id":"000030224","type":"book","title":"Pollen, seed, and mollusk analysis of a sediment core from Pickerel Lake, northeastern South Dakota. - Boulder, CO","container-title":"Bulletin of the Geological Society of America ; 79.1968, S. 855-876 : 4 Ill. ; 1 Tab","author":[{"family":"Watts","given":"William A."}],"issued":{"raw":"1968"}}