Geological map 1:50 000 To GK25

Online freely available Geological map sheets 1:50 000 (GK50) with links. In addition, researchers can propose public domain map sheets of the GK50 for digitization by the FID GEO free of charge: Digitisation Request Form
 
Geologische Specialkarte des Grossherzogthums Hessen und der angrenzenden Landesgebiete im Maassstabe von 1: 50 000, herausgegeben durch Hofbuchhandlung von G. Jonghaus in Darmstadt
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