John Ross. Course of the River Mississippi. 1775.

ROSS, Lieutenant John (1744-1809).Course of the River Mississippi, from the Balise to Fort Chartres; taken on an expedition to the Illinois.Engraved map with original hand color in outline.London: Robert Sayer, 1 June 1775.46" x 21 1/4" sheet.An early map of the Mississippi River based on English sources, second issue with additions of Fort St. Leon and Fort St. Mary just south of New Orleans. Earlier English maps more generally focused on the Mississippi River valley rather than the river itself. Phillips Maps of America p. 439.Condition: Top edge hinged to later paper panel with grommets, a few mild marginal stains. The Most Influential Map of the Mississippi River on the eve of the American Revolutionary War. Highly detailed map of the Mississippi River, from just north of the confluence of the Ohio River to the Gulf of Mexico, published by Thomas Jefferys in London. Lieutenant Ross' large scale map of the Mississippi River is of the few large format maps of the Mississippi publishe