The physical item is not available at the Boston Public Library.
In The journal of Major George Washington (London : Williamsburgh printed, Reprinted for T. Jefferys, 1754).
A young George Washington kept a journal of his activities during his mission to the Ohio region in 1753. The journal was published in Willamsburg in 1754, and copies were sent to London-based publisher Thomas Jefferys who published the work, along with this map, in 1754. As this map was not included in the original Williamsburg edition, Jefferys may have based his geography on the western portion of Joshua Fry's and Peter Jackson's preliminary work for their landmark map of Virginia.