{"id":"000030788","type":"book","title":"A postglacial pollen diagram from a small typha swamp in northwestern Minnesota, interpreted from pollen indicators and surface samples. - New York, N.Y","container-title":"Ecological monographs ; 37. 1967, No. 2, s. 145-172 : zahlr. Ill","author":[{"family":"Janssen","given":"C. R."}],"issued":{"raw":"1967"}}