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Dec 2 2008, 4:24 AM EST (current) j.weinheimer 13 words added, 1 widget deleted
Dec 2 2008, 4:22 AM EST j.weinheimer 1 widget added, 1 widget deleted

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There are two arrangements of the books in the library: everything cataloged until July 2006 is in an abbreviated Dewey Decimal classification, while everything cataloged after July 2006 is in the Library of Congress classification. The way to tell the difference is:
    • when a the classification starts with a number, e.g. 813.54 SIO, the number is a Dewey Decimal number
    • when the classification starts with a letter, e.g. HQ503.C66 2005, it is a Library of Congress number. For a map of the library and more information, see: Map of AUR Library.
But, if you are going to use other collections, they very well may have different classifications from either of these. For example, the following book is held in several libraries in Rome:
La monarchia meridionale : istituzioni e dottrina giuridica dai Normanni ai Borboni / Mario Caravale. -- Roma : Laterza, 1998. -- 330 p. ; 21 cm. (Collana di fonti e studi ; 6) (Fonti e studi (Centro europeo di studi normanni) ; 6)

But the numbers that each library assigns is quite different:
Biblioteca del Senato Storia del diritto B. 74
American Academy in Rome 722.2.Cara.Mon
British School at Rome 515.C.4
LUMSA - Biblioteca G. Petrocchi DM.III.720
LUMSA - Biblioteca M. Colonna Var.2

This same book also has the following numbers:
Library of Congress KKH246 .C37 1998
Dewey Decimal 340.550945 C176m

If AUR would get this book today, we would assign the Library of Congress number.

It is important to realize that different libraries arrange their materials in different ways.
When you do research, you are expected to manage any and all
classification systems you may come across, but you almost
always will have to ask librarians for help to find an item the first time.