Purple Mountain Pr Ltd · Purple Mountain Press
| title | ISBN-13 | year of publication |
|---|---|---|
| The Catskills: A Geological Guide | 978-1-930098-62-6 | 2004 |
| The Catskills: A Geological Guide | 978-0-935796-40-7 | 1993 |
| The Catskills in the Ice Age, Revised Edition | 978-1-930098-41-1 | 2003 |
| The Other Side of Time: Essays by "The Catskill Geologist" | 978-1-930098-82-4 | 2007 |