Arranged chronologically: 1,676 items described, overview, illustrations, reference works, list of forgers after 1900; I'm guessing the fourth oldest profession.
Beahm, George edits
Hulten, K G Pontus
Magriel, Paul compiles
Van Den Briele, Luc.
Paul, John edits
Kubasiewicz, Jan and Monica Strauss edit
Hambourg, Maria Morris and others edit
Baring-Gould, William S. and Cecil Baring-Gould introduce and annotate