Because many people have been asking me lately what means clavis coptica to which I often refer in my studies and on this blog, I am posting here a response from Tito Orlandi, the director of the Corpus dei manoscritti copti letterari project:

“The Clavis Coptica (or Clavis Patrum Copticorum) is the complete list of the literary and Patristic works which form the Coptic literature, modeled on the example of the Clavis Patrum Graecorum (by Geerard) and the Bibliotheca Hagiographica Graeca/Latina/Orientalis.

Each work has an identification number of 4 digits, which may be quoted as: cc0000.

The list is presently found on the web page of the Corpus dei Manoscritti Copti Letterari
(http://cmcl.let.uniroma1.it) accompanied by information on manuscripts, content, and
critical problems.

The bare list (id. number, author-title) will soon be found for free on the Hamburg web page of the CMCL. A printed Clavis Coptica is in preparation.”