I.Lloyd/P.Pugh,Hives & the Merlin,Icon,2004,P.139: “By 1937 (A.M), convinced that 100 octane fuel (developed and tested by USAAF) could boost the power of aero-engines, began importing small quantities…The first full cargo of ‘BAM100’ was shipped in June,1939 from the Esso refinery in Aruba…Most shipments came from Esso and Shell refineries in USA, but fortunately some came from Aruba and Curacao (Neth. W.Indies) for, when war was declared (3/9/39) Congress invoked the Neutrality Act”.