{"id":"000027356","type":"book","title":"Definition of Wisconsinan stage: contributions to stratigraphy.- Washington, D.C","container-title":"Geological Survey Bulletin; 1274-E. 1968, S. 1-22: 1 Kt.; 1 Tab","author":[{"family":"Frye","given":"John C."}],"issued":{"raw":"1968"}}