A chart by Robert Sayer and John Bennett titled in part Chart of the Harbour of Boston; image credit on full record.
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Nautical Chart; Sayer (Robert), Chart of the Harbour of Boston..., 1776, 34 inch.
A Chart of the Harbour of Boston With the Soundings, Sailing-Marks, and Other Directions from the North American Pilot for New England[more detail available via subscription]