AC - Collections and Collected Works 177,102
AS - Academies 60,424
AP - Periodicals 24,202
AM - Museums and Collecting 13,337
AY - Yearbooks, Almanacs, Directories 12,351
AZ - History of Scholarship 6,960
AE - Encyclopedias 5,192
AG - Dictionaries and Reference 3,907
AN - Newspapers 2,681
AI - Indexes 1,708
K - General Law 1
N - Visual Arts 1
PL - Eastern Asia, Africa, Oceania 1
Z - Books and Writing 1