Description
Published:Began and ceased with: 20th ed., June 23, 1993.
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