Columbia subject headings:
Gaguin, Robert, 1433-1501.
Gutenberg, Johann, 1397?-1468.
Printing--France--Paris--History.
Harvard subject headings:
Gaguin, Robert, 1433-1501.
Gutenberg, Johann, 1397?-1468.
Paris (France)--Imprints.
Printing--France--Paris--History.
Printing--History--Origin and antecedents
Princeton subject headings: