Frost action and vegetation patterns on Seward Peninsula, Alaska : a study of the geomorphic significance of vegetation patterns as related to frost action at high latitudes and in areas of perennially frozen ground / by D.M. Hopkins and R.S. Sigafoos.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1951.
Washington : United States Government Printing Office
Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
Includes bibliographical references (pages 99-100) and index.
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