Limits, or Facets, are terms from the metadata (descriptions) of the items in your search results, grouped and counted. Because limits depend on the presence and consistency of the descriptive metadata, they sometimes are not a complete representation of the results.
After you carry out your search, you can choose to use Limits to view only the most relevant results. Limits can be very useful to help you focus your search, and when searching for specific formats such as Music or Cartographic materials.
In the Books Advanced Search, you can choose to can apply some limits before you search.
Example: Zero in on an author with a common name:
An Advanced Books Search for the Author John Barton finds over 300 results by several authors with that name.
Use the author limit to distinguish among the individuals by full name or birth/death dates
Example: Limit by Geographic Region:
An Advanced Books Search for the Subject Java finds over 2700 results, most of them about the computer programming language. Use the Geographic Region limit to focus on the location, Java. Remember that a Geographic Descriptor must be present in the metadata (description of the item) in order for the Limit to be applied. For example there are 270 items with the Geographic Descriptor Java included, and there are 194 items with the Geographic Descriptor Java (Indonesia) included: