D. M. · Donald E. · Donald Markle · E.M.
Barnes & Noble · Hippocrene Books
| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| Pennsylvania: An Illustrated History | Paperback | 978-0-7818-1197-2 | 2009 |
| Spies and Spymasters of the Civil War | " | 978-0-7818-1037-1 | 2004 |
| Spies and Spymasters of the Civil War | " | 978-0-7818-0761-6 | 1999 |
| Spies and Spymasters of the Civil War | Hardcover | 978-1-56619-976-6 | 1998 |