Last but not least:
Multiple Copies: Multiple copies of the same book are shelved in order by the copy number.
Various Editions: Various editions of a book are shelved in order by the year of publication.
Prefixes: Call numbers sometimes have prefixes to identify a special location where the book or other material is shelved. Prefixes used in the MTSU Library include the following:
R: Reference - R 001.3 R63h 1979 [Located in the Reference area on the first floor].
OS: Oversive books - OS 736.4 C57b [Located on the oversize shelves at the front of the shelving area on every floor].