Bibliography
| 1. | 1995 - E Willard Miller – A Geography of Pennsylvania |
| 2. | 1995 - E Willard Miller – A Geography of Pennsylvania |
| 3. | 1996 - Frank Dale - Delaware Diary, Episodes in the Life of a River, |
| 4. | 1972 - C.A. Weslager - The Delaware Indians - A History |