Geologische Karte von Nordrhein-Westfalen 1:25 000. /
Geologisches Landesamt Nordrhein-Westfalen.
Krefeld : Geologisches Landesamt Nordrhein-Westfalen,
1961-
Includes cross sections.
Each sheet accompanied by text with title: Erläuterungen zur Geologischen Karte von Nordrhein-Westfalen 1:25 000.
Sheets are interfiled with other states of Germany.
See graphic index in central (thematic) file, under Germany, geology.
Geology