Printer of the 'Catholicon' (or Johann Gutenberg?)

Mainz: 3 entries:

• B-010 Balbus, Johannes — Catholicon. — [Mainz: Printer of the Catholicon or Johann Gutenberg(?)], ‘1460' or [not before 1469] or [between 1460 and c.1472]. Folio.
• M-149 Matthaeus de Cracovia — Dialogus rationis et conscientiae de frequenti usu Communionis. — [Mainz: Printer of the ‘Catholicon', not before 1469.] 4°.
• T-117 Thomas Aquinas — De articulis fidei et ecclesiae sacramentis. — [Mainz: Printer of the ‘Catholicon', c.1469]. 4° in divided half-sheets.

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