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How do I read NLM call numbers?
What does the call number mean?
The National Library of Medicine Classification System arranges materials by subjects. The first sections of the call number correspond to the book's subject. The letter-and-decimal section of the call number usually represent the author's name or the book's title. The last section of the call number is the date of publication. This table illustrates how to read the sections of a call number.
| The Book | The Call Number |
|---|
 | Title: Harrison's Principles of Internal Medicine | The first two lines describe the subject of the book.
WB100=Practice of medicine | WB | | 100 | This line represents the author's last name or the title.
H332p=Harrison | H332p | | The year the book was published. | 1998 |
|
| Author: Fauci, Anthony S. |
| Call number: WB 100 H322p 1998 |
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