===Primary Classifications===
*{| class="wikitable" style="text-align: left"|-|A = Arms (Heraldry)*|-|C = Chivalry*|-|E = Encyclopediæ*|-|F = Fiction*|-|G = Genealogy*|-|H = History*|-|M = Maps, Atlases, Gazetteers*|-|N = Numismatics*|-|P = Philatelics*|-|R = Royalty, Nobility, Biography*|-|S = Staff support*|-|W = Who's Who|}
Other categories may well prove necessary over time.