• New Advent Catholic Encyclopedia: "Trithemius"
  A concise entry on Trithemius.
  

• The Pragmatics of the New: Trithemius, McLuhan, Cassiodorus
  A scholarly article by James J. O’Donnell.
  

• Johannes Trithemius Main Page
  Digitized version of Trithemius's piece on "secret writing," in Latin.
  

• Trithemius, Johannes "Steganographia (Secret Writing). 1500."
  Digitized version of Trithemius's piece on "secret writing," in Latin.
  

• Johannes Trithemius
  A high resolution image of one page from Trithemius's "secret writing," with a brief description.
  

• Manuscript images of Medieval technologies of the word
  Exactly ten manuscript images of the technology of the word in the Middle Ages.
  

• Digital Scriptorium
  A Prototype Image Database & Visual Union Catalog of Medieval and Renaissance Manuscripts.
  

• Bodleian Library: Western manuscripts to c.1500
  Browse online images of manuscripts.
  

• A Brief History of Writing Instruments
  A brief history of writing instruments by Mary Bellis.
  

• Medieval and Renaissance Book Production: Manuscript Books
  A history of the invention of the book as well as the function of manuscripts written by Richard W. Clement.
  

• New Advent Catholic Encyclopedia: Divine Office
  A concise entry on "The Divine Office."
  

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