With a little bit of searching you can find many books, articles and databases at Ancestry. Some are free others require a membership.
- Deaths taken from the Delaware gazette
- Delaware River, Settlements of the Dutch, Swedes, and Finns, 1631-64
- Pennsylvania and the Lower Counties of Delaware, 1681-1740
- Wilmington, Delaware, 1920
- Maryland-Pennsylvania and Delaware Boundary
- Maryland-Pennsylvania and Delaware Boundary
- Maryland-Pennsylvania and Delaware Boundary
- Maryland-Pennsylvania and Delaware Boundary
- Maryland-Pennsylvania and Delaware Boundary
- Historical sketch of Chester, on Delaware
- Legal lore of the bench and bar of Delaware County
- History of the Delaware County National Bank
- Who’s who in Delaware County
- History of Delaware County for the past century
- The Bennett family of Sussex County, Delaware
- Wilmington, Delaware
- Some records of Sussex County, Delaware
- Delaware Pensioners, 1835
- Indian land sales in Delaware
- Early clergy of Pennsylvania and Delaware
- Chester and Delaware Co. directory for 1869-70
- Colonial mansions of Maryland and Delaware
- Charles Springer of Cranehook-on-the-Delaware
- The Bennett family of Sussex County, Delaware
- Watson family records, Wilmington, Delaware
- Wilmington, Delaware
- Some records of Sussex County, Delaware