British supply centres - London, Cardiff, Liverpool, Newcastle, Scapa Flow, Alexandria, Jerusalem
German supply centres - Munich, Berlin, E. Prussia, Kiel, Breslau, Cologne, Essen
French supply centres - Paris, Marseilles, Brest, Bordeaux, La Rochelle, Calais, Algeria
Russian supply centres - Moscow, Leningrad, Stalingrad, Minsk, Kiev, St Petersburg, Baku
Italian supply centres - Rome, Trieste, Tripoli, Genoa, Florence, Naples, Sardinia
I'm wondering whether to get rid of Poland and have Spain as a power, although it ruins historically accurate if spain dont stay neutral