http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
National Geospatial-Intelligence Agency.
Each edition supersedes previous edition.
Sailing directions (planning guide). North Atlantic Ocean and adjacent seas
Sailing directions (enroute) for the Baltic Sea (southern part)
Pub. (United States. National Geospatial-Intelligence Agency) ; 194