A separately issued 1839 map of Boston offered in its scarce first edition. This very uncommon map was compiled by George Washington Boynton for the Boston publisher Nathaniel Dearborn. Presented with an unusual westward orientation, this map covers early 19th century Boston and the surrounding cities of South Boston, East Boston, and Charlestown with parts of adjacent Cambridge, Roxbury, and Chelsea. When this map was drawn the Mill Dam had been completed, but Back Bay landfill and other reclamation projects of the mid-19th century were not yet planned. The map identifies rail lines (complete with tiny engraved trains), some property owners, businesses, and important buildings. A reference table at bottom center details government buildings, churches, and public houses. This map appeared in many issues through the late 1950s, this being the first and scarcest edition. It is noteworthy that this is a separately issued map. It was never folded or bound into a book of any kind, so it is exceptional to discover an example that has been so preserved. Later issues appear folded and printed on very thin onion skin paper. The earliest editions were printed via steel plate, but sometime in the early 1840s, the printing was transitioned to lithographic stones which were used and revised until the final issues in the 1850s.