Detail of "Carte de la Baiae de Chesapeake et de la Partie Navigible des
Rivieres: James, York, Patowmack, Patuxent..." [Chart of the Chesapeake Bay
and Detail of the Navigable Parts of the Rivers James, York, Potomac and
Patuxent...] published by the Departemente de la Marine, Paris; 1778.
Note that Bolingbroke is mistakenly shown as a town.
The sailing directions for the Choptank river read: "The Choptank River can
be navigated by boats up to the bridge, ie., they can go seven miles up into
the Delaware Colony" (translation by Tom Edwards).