Historic Maps are invaluable when doing historic research. Some useful sources are the Library of Congress https://www.loc.gov/maps/ and David Rumsey https://www.davidrumsey.com/view/luna.
U.S. Coast and Geodetic Historic Maps
HistoricMapworks is a pay site but they have tons of old maps
The internet allows access to hard-to-find texts. Sources are numerous.
For older publications on Delaware archaeology visit the digital library at https://www.delawarearchaeology.org.
General historic documents can be found at the internet archives https://archive.org
Jamestown has a number of websites including Virtual Jamestown
Their transcription of Henry Norwood’s 1649 account of the eastern shore can be found atNorwoods adventure
Delmarva Genealogy and HIstory
The Miles Files (genealogy mostly ESVA)
Hannah Burton Diaries
Hannah Burton (1776-1823) left two journals written in the early 19th century.