Subject Headings
The library catalog uses Library of Congress Subject Headings. The list of authorized subject headings is available in the 5-volume set at the Reference Desk. However, you can start with keyword searches to gather some relevant titles, then look at their subject headings to discover the official terms to use.
Here are some subject headings related to U.S. Middle East Relations:
United States -- Foreign relations -- Middle East
United States -- Foreign relations -- Arab countries
United States -- Foreign relations -- [country]
Middle East -- Peace -- International cooperation
Consider using narrower terms, such as:
Eisenhower doctrine
Iraq-Kuwait Crisis, 1990-1991
More on Subject Searching:
Libraries and database creators try to structure language in a way to make browsable lists. Subject terms tend to be set up in a hierarchical manner. United States -- Foreign relations is an excellent example of this principle. To understand this better, try a Keyword search in the Randall Library Catalog for "United States -- Foreign relations" Then, repeat the search as a Subject search.
You may also wish to browse the Reference Collection to see what special sources are available. For more detail, see the outline from the Library of Congress: http://www.loc.gov/catdir/cpso/lcco/lcco.html