Library of Congress Classification System (L.C.)
The Library of Congress Classification System (LC System) is used to organize books in many academic and university libraries throughout the United States and world.source : http://geography.about.com/library/congress/bllc.htm
source of the picture : http://www.bc.edu/libraries/help/howdoi/howto/booksonshelf.html
Dewey Decimal Classification (DDC)
The Dewey Decimal Classification (DDC, also called the Dewey Decimal System) is a proprietary system of library classification developed by Melvil Dewey in 1876.
It has been greatly modified and expanded through 23 major revisions, the most recent in 2011. This system organizes books on library shelves in a specific and repeatable order that makes it easy to find any book and return it to its proper place. The system is used in 200,000 libraries in at least 135 countries.
source : http://en.wikipedia.org/wiki/Dewey_Decimal_Classification
source of the picture : http://lrc.sierracollege.edu/searchpath/glossary/callnumber-pop.html
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