(London)International Congress on Polymer Concretes International Congress on Polymer Concretes 9th international congress on cybernetics Preceodings of the First International Congress on Polymor Concretes (Tokyo)International Congress on Combustion Engines 10th International congress on cybernetics (Washington)International Congress on Combustion Engines (London)International Iron and Steel Congress International Congress on Cybernetics (Barcelona)International Congress on Combustion Engines