AC - Collections and Collected Works 176,557
AS - Academies 60,192
AP - Periodicals 24,144
AM - Museums and Collecting 13,230
AY - Yearbooks, Almanacs, Directories 12,329
AZ - History of Scholarship 6,848
AE - Encyclopedias 5,168
AG - Dictionaries and Reference 3,902
AN - Newspapers 2,657
AI - Indexes 1,710
K - General Law 1
N - Visual Arts 1
PL - Eastern Asia, Africa, Oceania 1
Z - Books and Writing 1