AC - Collections and Collected Works 174,862
AS - Academies 59,413
AP - Periodicals 23,922
AM - Museums and Collecting 12,618
AY - Yearbooks, Almanacs, Directories 12,200
AZ - History of Scholarship 6,505
AE - Encyclopedias 4,746
AG - Dictionaries and Reference 3,812
AN - Newspapers 2,560
AI - Indexes 1,696
K - General Law 1
N - Visual Arts 1
PL - Eastern Asia, Africa, Oceania 1
Z - Books and Writing 1