http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
4 volumes : illustrations, maps. ; 25 cm.
Issued in 2 pts. Bd. 2 is loose-leaf for updating.
Kept up to date by numbered supplements called: Geokartenbrief.
Continued in 1980 by: Geo Katalog (Stuttgart, Germany : 1980)