Greenland Icefields and Life in the North Atlantic. With a New Discussion of the Causes of the Ice Age, by G. Frederick Wright ... and Warren Upham ....G. Frederick Wright1896
The Ice Age in North America, and Its Bearings Upon the Antiquity of Man, by G. Frederick Wright ... With an Appendix on "The Probable Cause of Glaciation", by Warren Upham ..G. Frederick Wright1889
The Ice Age in North America and Its Bearings Upon the Antiquity of Man ... with a Appendix on "The Probable Cause of Glaciation" by Warren Upham.G. Frederick Wright1890