Columbia subject headings:
Harvard subject headings:
Gutenberg, Johann, 1397?-1468.
Printing machinery and supplies--History.
Printing presses--History.
Printing--History
Printing--Technological innovations--History.
Publishers and publishing--History.
Princeton subject headings:
Gutenberg, Johann, 1397?-1468.
Printing machinery and supplies--History.
Printing presses--History.
Printing--History.
Printing--Technological innovations--History.
Publishers and publishing--History.