Description
Published:28th ed. (May 7/83)-33rd ed. (Apr. 20/91).
Item Description:Depths shown by isolines and soundings.
Relief shown by contours, hachures, and spot heights.
"Soundings in feet."
Electronic resource.
Physical Description:online resource (maps) : color
Publication Frequency:Irregular
Format:The .jpg versions of these maps require Adobe Photoshop or Adobe Acrobat 9 Pro to view.