Columbia subject headings:
Gutenberg, Johann, 1397?-1468.
Printing--History--Origin and antecedents.
Schaab, Carl Anton. Geschichte der Erfindung der Buchdruckerkunst.
Harvard subject headings:
Gutenberg, Johann, 1397?-1468.
Printing--History--Origin and antecedents
Schaab, Carl Anton.
Princeton subject headings: