Answered By: Steve Hanschu Last Updated: Feb 10, 2015 Views: 19
The bottom letters and numbers are called the Cutter number. The first letter is usually the first letter of the author's last name. The last letter is the first letter of the first word in the title. The numbers in between represent the subject matter based on the Dewey Decimal chart.
You can find more information here: http://www.library.illinois.edu/circ/tutorial/cutter.html
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