Most academic libraries use the Library of Congress system. The system is fairly easy to understand if you know how to read it.
Books are assigned a main subject, and then divided into sub-subjects as needed.
Items are then divided into sub-headings: Let's look at the D's.
Finally books are further divided into even more specific subject headings:
Books on Ancient Japan would be in the DS 801 - DS 897 area.
The main column on the page consists of the results of your search. You can sort the results by publication or relevance, and limiters that can be used to narrow your search results appear in the left column of the page.
The limiters are comprehensive, the options available to you appear in the table below.
|You can choose to see
only Peer-Reviewed, Full-Text,
and/or abstracted entries.
You can also limit your publication
|You can limit your results by
|Other limiting options are available.
Click the drop-down arrows to see
everything that's available.