==Primary Classifications==
*A = Arms (Heraldry)*C = Chivalry*E = Encyclopediae*F = Fiction*G = Genealogy*H = History*M = Maps, Atlases, Gazeteers*N = Numismatics*P = Philatelics*R = Royalty, Nobility, Biography*S = Staff support*W = Who's Who
Other categories may well prove necessary over time.