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Each book in the library is given at least one authorized Library of Congress Subject Heading. You can search for the authorized heading(s) associated with your topic in the LC Subject Authorities, then use the heading in your searches for better results.
The most general works can be found under the heading Conflict Management. The following list is more specific, but still fairly broad. You may identify narrower subjects related to your topic within these lists, or by searching for your subject in the catalogue.