000—Computer science, information and general works 100—Philosophy and psychology 200—Religion 300—Social Sciences 400—Language 500—Science 600—Technology and applied science 700—Arts and recreation 800—Literature 900—History and geography

Look at the second number after the “8. ” The number “1” indicates that the book is further classified as “American literature in general. ” The second number after the “8” further defines the division; 811 is American poetry, 812 is American Drama, 813 is American fiction, 814 is American essays and so on. Look at the first number after the decimal point; this number refines the classification even further. Thus, a book with a call number of “813. 4,” tells you that the book is American fiction written between 1861 and 1900. Obviously, the more numbers, the more specific the subject.

A General Works B Philosophy-Religion-Psychology C History (Civilization) D History (Except America) E American History F Local American history, Latin American History G Geography and Anthropology H Social Sciences J Political Science K Law M Music N Fine Arts P Language and Linguistics Q Science and math R Medicine S Agriculture T Technology U Military Science V Naval Science Z Bibliography and Library Science