Materials are arranged according to the Library of Congress (LC) call numbers. The call number is the column of letters and numbers on the spine of the book.
|QM||Materials are arranged in alphabetical order by the top line of the call number,|
|366.2||in numerical order by the second line,|
|.D97||and in alphabetical then decimal numerical order starting with the third line.|
|1992||Sometimes call numbers include a year, or a copy or a volume number.|
The Library of Congress Classification System uses 21 letters of the alphabet to represent the major branches or classes of knowledge.
|Major branches or classes of knowledge|
|B||Philosophy, Psychology, Religion|
|C||Auxiliary Sciences of History|
|D||History: General and Old World|
|E-F||History: Western Hemisphere|
|P||Language and Literature|
|Z||Bibliography: Library Science|