J. Thomàs 
Roosevelt, Franco, and the End of the Second World War [PDF ebook] 

Relations between the United States and Spain under Franco: from Pearl Harbor to the beginnings of the Battle of Wolfram (December 1941- September 1943) Return of Spain to neutrality and the beginnings of the Battle of Wolfram. The Laurel Incident (September- December 1943) The Battle of Wolfram (January-May 1944) Relations between the US and Spain from the Wolfram agreement till the end of the Second World War in Europe (May 1944- May 1945) United States and Spain from the end of the war in Europe till the start of diplomatic isolation of the Franco regime (May 1945- March 1947)