G. T. · Gilbert H. · Gilbert Haven · H.T.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Bird Friends: A Complete Bird Book for Americans | 978-1-144-93818-3 (1-144-93818-X) | 2010 |
| Laboratory and Field Exercises in Physical Geography | 978-1-143-03581-4 (1-143-03581-X) | 2010 |