Dr. Callahan

Cape Henlopen maps available at cema.ude.edu/ - Changing shorelines up to mid 1800's

For changes along Delaware shoreline:

https://www.dgs.udel.edu/publications/sp26-historical-coastline-changes-cape-henlopen-delaware

Patterns and rates of historical shoreline change in the Delaware Estuary,

https://udspace.udel.edu/handle/19716/20332

Also check out Delaware Wetlands Status and Trends. As low lying wetlands and salt marshes change to open water, we essentially lose shoreline,

https://dnrec.alpha.delaware.gov/watershed-stewardship/wetlands/status-and-trends/