Caruana, Leonard; Rockoff, Hugh - 2000 - Preliminary
together findings from the secondary literature and from new research in the Spanish archives. The war evolved through several … distinct phases. (1) An oil embargo against Spain, although launched when Germany appeared to be winning the war (July 27 to … joining forces with Germany. (2) Preemptive buying of wolfram (tungsten ore) during the middle years of the war was also …