Netbook of Proficiencies presents secondary skills and (primarily) non-weapon proficiencies for the AD&D game.
The document has a complex publishing history. The first "Version 1.0" of the document was published anonymously. A separate document entitled Some Non Weapon Proficiencies document was published separately. These documents were combined, revised, edited, and expanded into Netbook of Proficiencies "Version 2". This document was made available in ASCII and, later, DOC format.