An OSCAR Subject Search is an efficient way to locate materials about Cuba in the Mabie Law Library and the Santa Clara University Library. Suggested searches include:
Cuba -- History
Administrative Law -- Cuba
Law -- Cuba
Law -- Latin America
Law -- Caribbean
Many of the materials you will find are quite old (19th and 20th Century) and are accessible via subscription databases such as LLMC Digital and ProQuest. Some materials are on microfiche or are shelved in Remote Storage. Ask for help at Research Services if you need help locating materials.
The Organization of American States in 1962 excluded the government of Cuba from participation in the Inter-American System. See Final Act, Eighth Meeting of Consultation of Ministers of Foreign Affairs, OAS Official Records, OE A/Ser. C/II.8 (Eng.) Resolution VI, pages 294 and ff
On June 3, 2009 via AG/RES. 2438 (XXXIX-O/09), the Thirty-Ninth Session of the OAS General Assembly announced that Resolution VI ceased to have effect and "participation of the Republic of Cuba in the OAS will be the result of a process of dialogue initiated at the request of the Government of Cuba, and in accordance with the practices, purposes, and principles of the OAS."
The Avalon Project at Yale includes this link to the Lease to the United States by the Government of Cuba of Certain Areas of Land and Water for Naval or Coaling Stations in Guantanamo and Bahia Honda, July 2, 1903.