AC - Collections and Collected Works 175,278
AS - Academies 59,542
AP - Periodicals 23,984
AM - Museums and Collecting 12,731
AY - Yearbooks, Almanacs, Directories 12,211
AZ - History of Scholarship 6,567
AE - Encyclopedias 4,753
AG - Dictionaries and Reference 3,820
AN - Newspapers 2,571
AI - Indexes 1,698
K - General Law 1
N - Visual Arts 1
PL - Eastern Asia, Africa, Oceania 1
Z - Books and Writing 1