The product is a vintage United States Coast Survey chart of the Kennebec and Sheepscot Rivers in Maine. This navigational chart would have been used by mariners and navigators to plot their courses along the coast of Maine. The detailed information provided on the chart would have helped sailors to navigate safely and accurately through the rivers and around the various landmarks and hazards.
This is an estate find, so I don’t know much about it. There are rips and stains as shown in photos.