http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Sailing directions (enroute) for the North Sea
National Geospatial-Intelligence Agency.
Each edition supersedes previous edition.
Issued by: Defense Mapping Agency, Hydrographic/Topographic Center, 1980-19 ; by: Maritime Safety Information Division, National Imagery and Mapping Agency, <2000-> ; by: National Geospatial-Intelligence Agency, <2010->.
Sailing directions (planning guide). North Atlantic Ocean and adjacent seas
Pub. (United States. Defense Mapping Agency. Hydrographic/Topographic Center) ; 192
Pub. (United States. National Imagery and Mapping Agency) ; 192
Pub. (United States. National Geospatial-Intelligence Agency) ; 192