W.S. · William J. Switala · William S.
| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Underground Railroad in Delaware, Maryland, and West Virginia | 978-0-8117-3143-0 (0-8117-3143-X) | 2004 |
| Underground Railroad in New York and New Jersey | 978-0-8117-3258-1 (0-8117-3258-4) | 2006 |