Library catalogs and article databases use a special form of subject tagging to help users find materials on subjects. By using these terms you can get good search results and reduce the number of irrelevant items in your result list.
For works on historical and contemporary U.S. foreign policy, include the terms
United States foreign relations
in your search. To this you can add specific countries, events, or other topics. For example:
This will give you more relevant and precise results. To identify published primary sources, you can also add the terms like
to your search.
Some Other Sources of Books