AC - Collections and Collected Works 174,380
AS - Academies 59,388
AP - Periodicals 23,912
AM - Museums and Collecting 12,598
AY - Yearbooks, Almanacs, Directories 12,196
AZ - History of Scholarship 6,500
AE - Encyclopedias 4,738
AG - Dictionaries and Reference 3,810
AN - Newspapers 2,560
AI - Indexes 1,692
K - General Law 1
N - Visual Arts 1
PL - Eastern Asia, Africa, Oceania 1
Z - Books and Writing 1