AC - Collections and Collected Works 174,983
AS - Academies 59,435
AP - Periodicals 23,947
AM - Museums and Collecting 12,648
AY - Yearbooks, Almanacs, Directories 12,198
AZ - History of Scholarship 6,517
AE - Encyclopedias 4,747
AG - Dictionaries and Reference 3,813
AN - Newspapers 2,565
AI - Indexes 1,697
K - General Law 1
N - Visual Arts 1
PL - Eastern Asia, Africa, Oceania 1
Z - Books and Writing 1