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Understanding Call Numbers
http://geography.miningco.com/library/congress/blhowto.htm
A tutorial to help unlock the mysteries of Library of Congress call numbers. Some tips about call numbers. Has a link to tables with more detail on each major subject area, like Q for science.
Understanding Call Numbers
http://honolulu.hawaii.edu/legacylib/callno.html
Explains how library books are assigned their places on the shelves, using Library of Congress Classification.
Using Call Numbers
http://www.wcsu.edu/library/using_call_numbers.html
Why libraries use call numbers. The three kinds of numbering systems used the most in the United States. Common SuDocs prefixes, an outline of the Library of Congress Classification system, and a quiz on LC call number order.