Description
Published:Began with 17th ed., May 18, 1985; ceased with 19th ed., Mar. 23, 1991.
Item Description:Depths shown by isolines and soundings.
Relief shown by contours and spot heights.
"Soundings in feet."
Inset: Blue Hill Harbor. Scale 1:20,000.
Includes tidal information.
Electronic resource.
Physical Description:online resource (maps) : color
Publication Frequency:Irregular