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Most of Dana Porter Library's print books are on the 6-10 floors. They are arranged by subject using the Library of Congress' alphanumeric classification scheme.
Here is a skeleton breakdown of the scheme how it is arranged in the Porter library by floor.
A -- General works. Encyclopedias
B -- Philosophy. Psychology. Religion
C -- Auxiliary sciences of history such as chronology, heraldry, and genealogy
D -- DS World history and history of Europe, Asia
DS -- DX Asia, Africa, Australia, New Zealand, Romanies
E -- History of the United States including pre-settlement and Indigenous peoples
F -- History of the United States (state level), Canada, Latin America, Caribbean
G -- Geography. Anthropology. Recreation
H -- HE Economics
HF -- HX: Finance. Sociology. Women's history. Sexuality. Socialism
J -- Political science
K -- Law
L -- Education
M -- Music
N -- NK Fine arts and Architecture
NK-NX Arts in general
P -- PR Language and literature
PR Language and literature
Q -- Science. Mathematics
R -- Medicine. History of medicine
S -- T Agriculture and technology
U -- V Military and naval science
Z -- Bibliography. Library science