I've seen reference to "The Tactical Notebook" in references in a Bruce Gudmundsson book I've just read. It appears that it was a journal or magazine of, principally, primary sources on tactics. I was intrigued by the title as it was referenced on some of the more interesting points that the author had.

An online search has only revealed an ability to purchase backcopies in print dated to 1995. Does anyone know what exactly this was and if this exists in any format?