Map - Potomac River in Four Sheets (1862 - 1868) 

 -  Superintendent of the Survey of the Coast of the United States  1862 - 1868 
 - 4 sheets  25" x 34" 
<br/><br/> Sheet 1 - Entrance to Piney Point (1868)<br/>Sheet 2 - Piney Point to Lower Cedar Point (1862)<br/>Sheet 3 - Lower Cedar Point to Indian Head (1862)<br/>Sheet 4 - Indian Head to Georgetown (1864)