CT - Biography 54,700
CS - Genealogy 43,907
CD - Diplomatics, Archives, Seals 30,648
CB - History of Civilization 27,450
CJ - Numismatics 18,323
CC - Archaeology 16,848
CR - Heraldry 11,317
CN - Inscriptions, Epigraphy 6,606
C - General History 5,670
CE - Technical Chronology, Calendar 3,584
B - Philosophy 2
HE - Transportation and Communications 1
KF - United States 1