Oesterle Library uses the Dewey Decimal System to classify its books. See the chart below to match subjects and Dewey Decimal numbers to the locations of books in the library building. For more information on the Dewey Decimal System, see OCLC's Dewey Decimal System Summaries
Note: All books with call numbers beginning with "R" are located in the Reference Room. All books with call numbers beginning with "j" or "C" are located in Giere Audiovisual Center.
| 000s | Computer Science, Information, and General Works | Location: Upper Level, above Giere Audiovisual Center |
| 100s | Philosophy & Psychology | Location: Upper Level, above Giere Audiovisual Center |
| 200s | Religion | Location: Upper Level, above Giere Audiovisual Center |
| 300s | Social Sciences | Location: 300-329 Upper Level, above Giere Audiovisual Center 330-399: Upper level, above Reference Room |
| 400s | Language | Location: Upper level, above Reference Room |
| 500s | Science | Location: Upper level, above Reference Room |
| 600s | Technology | Location: Upper level, above Reference Room |
| 700s | Arts & Recreation | Location: Upper level, above Reference Room |
| 800s | Literature | Location: 800-813: Upper level, above Reference Room 814-899: Lower level, Reference Room |
| 900s | History & Geography | Location: Lower level, Reference Room |
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