Once you've determined the general library location, the call number will lead you to the specific shelf location.

• Almost all books in the Biomedical Libraries are shelved according to the Library of Congress classification system.
  
  
• The call numbers result in books being shelved together in groups by subject, allowing for easy browsing.
  
  
• Each book has a unique call number composed of letters, numbers, and dates.
  
  
• In the catalog, the call number is displayed horizontally:
  R118.6 .R54 2005
  
  
• On the book, usually on the spine, the call number is printed vertically:
  R
  118.6
  .R54
  2005
  
  
• When looking for a book, start with the top line or first element, and match to books on the shelf with the same letter or letters, searching in alphabetical order. Once you've found the right letter(s), match the second line, searching in numerical order, and so on, line by line.
  
  
• A few books in Dana have call numbers that start with a number, not a letter, such as 616 A198p. These older books are classified with the Dewey Decimal System and are shelved in a staff-only area. Ask at the Circulation Desk for assistance.

For an explanation of how to read call numbers in an academic library see http://www.usg.edu/galileo/skills/unit03/libraries03_04.phtml.

An outline of the Library of Congress classification system may be found at http://www.loc.gov/catdir/cpso/lcco/lcco.html.