CT - Biography 54,715
CS - Genealogy 43,930
CD - Diplomatics, Archives, Seals 30,642
CB - History of Civilization 27,448
CJ - Numismatics 18,322
CC - Archaeology 16,842
CR - Heraldry 11,317
CN - Inscriptions, Epigraphy 6,604
C - General History 5,679
CE - Technical Chronology, Calendar 3,584
B - Philosophy 2
HE - Transportation and Communications 1
KF - United States 1