David C. Roberts

A Field Guide to Geology: Eastern North America  David C. Roberts W. Grant Hodsdon Roger Tory Peterson David C Roberts Paperback. Houghton Mifflin, 2001-09-30 ISBN 9780618164387     Peterson Field Guide to Geology of Eastern North America (Peterson Field Guides (R) Series)  David C. Roberts Roger Tory Peterson Hardcover. Houghton Mifflin, 1996-10-14 ISBN 9780395663264