A copy of Henry Popple's key map of his Map of the British Empire in America as adapted by Le Rouge. This is state 2 of the Probst map, differing from the very rare state 1 only in the designation of the prime meridian in the bottom-right corner of the border. McCorkle 782.14. Babinski, Popple, Addendum, note 91, pages A48-A53.
