The Proton Milliprobe Ink Analysis of the Harvard B42, Volume II & An Ersatz Leaf in the Doheny Gutenberg Bible Volume I - The Papers of the Bibliographical Society of America Volume 81:4, December 1987
Book #619: The Proton Milliprobe Ink Analysis of the Harvard B42, Volume II by Richard N. Schwab, Thomas A. Cahill, Bruce H. Kusko, Robert A. Eldred, and Daniel L. Wick. An Ersatz Leaf in the Doheny Gutenberg Bible Volume I by Richard N. Schwab. The Papers of the Bibliographical Society of America, Volume 81:4, December 1987. Because of these two items you learn that Johann Gutenberg had made 6 presses at the end. You can understand why it really got into money to make the 40-41-42 lines and the 42-line Gutenberg Bibles.
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