The Lindell Library - like most academic libraries, uses the Library of Congress classification system to organize our print books. If your eyes have already glossed over - no worries.
Here's a quick reference chart to help you find books by subject.
On the 3rd Floor you'll find:
A - General works (Encyclopedias, dictionaries, etc.)
B - Philosophy, Psychology, Religion
C - Auxiliary Sciences of History (Archeology, Archives, Genealogy, etc.)
D - World History (non-Americas)
E - History of the Americas (United States)
F - History of the Americas (Canada, Latin America, etc.)
G - Geography, Anthropology, recreation
H - Social Sciences (Statistics, economics, transportation and communications, commerce, finance, sociology, etc.)
J - Political Science
On the lower level you'll find:
K - Law
L - Education
M - Music, books on Music, Scores
N - Fine Arts
O - Oversize books
P - Language & Literature
Q - Science (Math, physics, chemistry, geology, botany, biology, human anatomy, microbiology)
R - Medicine (Pathology, internal medicine, surgery, pharmacology, nursing, etc.)
S - Agriculture
T - Technology
U - Military Science
V - Naval Science
Z - Bibliography, Library Science, Information sources