http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
produced by the United States Geological Survey.
Depths shown by isolines and gradient tints.
Scale 1:500,000. 1 in. = approx. 8 miles ;
Lambert conformal conic proj., based on standard parallels 33 and 45