Alumni Library organizes its collections by subject. These subjects are represented by a call number system called the Dewey Decimal Classification System (DDC). DDC uses call numbers that begin with numbers.
If you were looking for the book 'Yin Yu Tang : The Architecture and Daily Life of a Chinese House' by Nancy Berliner using the online catalog you would find that the call number is 720.951 .B47 2003.
|720||The main number can be any three-digit number between 001 and 999. This identifies the broad subject category the item is classified in. In this case 720 denotes 'architecture.'|
Any number following the decimal further specifies within the broader category a narrower subject. In this case the .951 stands for China. In this way all architecture items about China will gather next to each other on the shelf.
This number is a true decimal number, this means that 720.951 will be shelved before 720.96 on the shelf because it's a smaller number.
|.B47||The third section describes the author. The .B47 stands for the author's last name (Berliner)|
|2003||The book was published in 2003|