Crown Publishers · Dover Publications
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Covered Bridges of the Middle West | 978-0-517-12846-6 (0-517-12846-2) | 1970 |
| Covered Bridges of the Northeast | 978-0-486-43662-3 (0-486-43662-4) | 2004 |
| The Northrop Story | 978-0-517-56677-0 (0-517-56677-X) | 1990 |
R. A. · R. Allen · R. S. · R S A · R.S. Allen · R Sanders · Richard A. · Richard Allen · Richard S. · Richard Sanders · s. a. · S. Allen · Sanders a