Dear Ms. Rose,
Thank you for posting your request to History Hub!
If you have not already done so you should consult FOREIGN RELATIONS OF THE UNITED STATES (FRUS). This is a State Department publication of selected documents from State Department files and other sources. Besides providing the text of important foreign policy documents, FRUS also provides the source file numbers (printed either with the document or as footnotes) which are the keys to obtaining access not only to the printed item but to other documents on the same subject but not selected for publication. Volumes are available online at http://www.state.gov/r/pa/ho/frus/ and http://digicoll.library.wisc.edu/FRUS/
The primary source for documentation on U.S. foreign policy and events in various countries is the Department of State central file, part of RG 59: General Records of the Department of State. The records consist of communications back and forth between the Department of State and American diplomatic and consular posts, internal Departmental documentation, communications with other government agencies and private organizations and the public, communications with diplomatic and consular officials from other countries in the United States, and related materials. More detail is at: http://www.archives.gov/research/foreign-policy/index.html.
The central files and the bulk of the rest of RG 59 records from the 1950s are the custody of the National Archives at College Park - Textual Reference (RDT2), which can be contacted via email at firstname.lastname@example.org.
The Dwight D. Eisenhower Presidential Library and Museum may also have records relating to your research topic. They can be contacted via email at email@example.com.
We hope this information is helpful. Best of luck with your research!