pt. I. On surface geology especially that of the Connecticut Valley in New England.--pt. II. On the erosions of the earth's surface, especially by rivers.--pt. III. Traces of ancient glaciers in Massachusetts and Vermont.
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 2000. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation as part of Making of America IV: the American voice, 1850-1877.