Eduard Imhof
DeLorme Mapping Company
Jong Jen-Yi
Emile D. Chevrier
Christian Degn
Mairs Geographischer Verlag. Stuttgart.
Rebecca E. Hirsch
Alice Garnett
Unknown Author
Aldo Casamento
Institut Cartogràfic de Catalunya.
P. D. A. Harvey
United States Geological Survey
David D. Fagan
Richard J. Pike
Dani Mador
United States. Congress. House. Committee on Rivers and Harbors