| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Biographical directory of the United States executive branch, 1774-1971 | 978-O-8371-5173-1 (O-8371-5173-2) | 1971 |
Ed.S. · R. E. · R. (ed.) · R. S. · R. Sobel · Robert E. · Robert (ed.) · Robert S. · Robert Sobel