A plain chart of the Caspian-Sea according to the observations of...John Elton ... presented to ... Jonas Hanway ... in 1745 / 
Elton, John.
Gibson, John.
Woodroofe, Thomas.
[London :  T. Osborne, &c.], 
1753 [1754]
In: An Historical Account of the British Trade over the Caspian Sea ... by Jonas Hanway. Vol. 1.