PAID 111 Section 23 - Hurley (Fall 2025)

Your open unit text:

Librarians are here for you.

These are a few of the ways we can help. We encourage you to get in touch!

• Research Guides: These Guides have been created by librarians to introduce you to various resources and services for research. On the Preus Library website, click on the Research Guides buttons on the right of the page.
• Research Help: Chat, email, or make an appointment with a librarian to consult on your research.

Call numbers? What are they?

Call numbers are assigned to each book in the library. They are used in order to:

• Help us find materials
• Group books by subject or topic

Who came up with this?

• J.C.M. Hanson, Luther College class of 1882, was head of the Catalog Division at the Library of Congress in 1897. Working with Charles Martel, Chief Classifier, the two developed the Library of Congress Classification System and the first volumes were published in 1901-1902. This is the most commonly used call number system in college and university libraries in the United States.

Classes A - L are on the First floor of Preus.

Classes M - Z are on the Third floor of Preus.

Infographic created by McMaster University Library.