Geology Writings, 1889-1890, undated

“A Moraine of Retrocession in Ontario,” 1890, 5 p., Bulletin of the Geological Society of America 1: 544-6 “The Motion of the Mini Glacier,” undated, 7 p. “The Nampa Image,” 1889, 26 p. “A New Estimate of Glacial Chronology from the Erosion of Plum Creek, Oberlin, Ohio,” undated, 7 p. “New Facts Bearing upon the Question of the Unity of the Glacial Period,” undated, 19 p.