Swedes and Finns farming both banks of the lower Delaware from Fort Christina (Wilmington).
Conquered by Dutch New Netherland; Fort Christina surrendered 15 September 1655.
Johnson's classic scholarly history of the Swedish colony on the Delaware, 1638-1664, and its relations with the Indians, Dutch, and English.
New Sweden within the contest for the mid-Atlantic and its Dutch conquest (broad context).
The classic dedicated monograph on New Sweden — covers the colony from Fort Christina's founding through the Dutch conquest of 1655. More polity-specific than either current entry.