Geo Katalog international.
Geo Center.
Stuttgart : Geo Center Internationales Landkartenhaus,
Issued in 2 pts. Bd. 2 is loose-leaf for updating.
Kept up to date by numbered supplements called: Geokartenbrief.
Maps
Maps
Geokartenbrief
Geo-Katalog
Geo Katalog (Stuttgart, Germany : 1980)