how to read a call number?
Each book has a specific location in the library.A call number tells you where is the book locatet exactly in the library, to go and find it or to returne it to its right place.
a call number contains , letters , numbers, decimals , date volume or copy number.
to find a certain book , patron should use the library catalog , on the library website or catalog search computers located in the library, each books has a call number that indicates where its located in the library.
for example
BS 110.L220 2012
Patrons should search for the book in BS section in the main collection , and it looks like this on the spine of the book:
BS
110
.L220
2012
 The first letters indicate the subject of the book, and its ordered alphabetically.
PN 197.52 
PN 197.6 
PN 197.649 
PN 197.68 
 the second raw contains numbers (whole number)
 The third line its called Cutter number , it starts with letters (alphabetically), and decimal numbers, EX. S110 comes after C612 and S60, but before S350 and T 20.
Decimals are different from whole numbers, for example 315.20 comes before 315.5 ( .20 is a smaller decimal than .5 , anything after the . is read alone 2 is smaller that 5 ) similarly 315.298563 comes before 315.3, because .298563 is smaller decimal than .3)
N 6537 
N 6537 
N 6537 
N 6537 
 the forth number is Date of publication, and it should be shelves in chronological order EX: 2002 comes after 1998 , but before 2008 , for the same book. of a book doesn't contains a date in the call number , that book comes before the same book that does have a date in the call number.
QC 981.8 G578

QC 981.8 G578 
QC 981.8 .G56 2006 
 the fifth number is the Volume number EX. v.2 , its shelved in whole number.A book that has no call number , always comes before the set of the same books that have a call number.
 the sixth number is the copy number for the same book EX . C.1 , C. 2. also shelved in whole number.
Z 1003.3 
ZA 1003.3 
ZA 1003.3 
remember: it is very important to take your time , because cutter number is very tricky