Description
Published:Began with 16th ed (Jan. 12/02).
Item Description:Depths shown by isolines and soundings.
Relief shown by hachures and spot heights.
"Soundings in fathoms."
Editions kept current by periodic online updates.
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.