There are many interesting instructional videos about printmaking on You Tube. Some are from artists, schools and museums. These are great to share with your students or when you need a refresher course once in awhile.

Minneapolis Institute of Art
has produced some very thorough presentations:

Relief

Intaglio

Lithography

Screenprinting

 The Renowned American Mariano Cebellos

The Renowned American Mariano Cebellos, Francisco Jose de Goya