English:
John Johnson's 1810 map of Fort Madison. Johnson was the U.S. trading factor.
Appears in contributor's book : Frontier Forts of Iowa, p.61,
ISBN
9781587298820
Date
Original Map dates from 1810
Source
Traced by the contributor, spelling as in original.
This work is in the
public domain
in its country of origin and other countries and areas where the
copyright term
is the author's
life plus 100 years or fewer
.