There has been data ("Dutch Fighter Aircraft: Dutch Fighter Aircraft 1930-1939, Fokker C.V, Fokker D.XXI, Fokker G.I, Koolhoven F.K.58, Fokker D.XXIII, Fokker D.XII") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Thu Jan 30 05:18:26 2020, so the data displayed here has been removed .