Columbia subject headings:
Gutenberg-Gesellschaft--Bibliography.
Gutenberg-Museum Mainz.
Printing--History--Societies, etc.
Harvard subject headings:
Gutenberg-Gesellschaft--Bibliography.
Gutenberg-Museum Mainz.
Printing--History--Societies, etc.
Princeton subject headings:
Gutenberg-Gesellschaft--Bibliography.
Gutenberg-Museum Mainz.
Printing--History--Societies, etc.