(Wash.)International Symposium on the Chemistry of Cement International Symposium on the Chemistry of Cement The Fifth International Symposium on the Chemistry of Cement (1968)The Fifth International Symposium on the Chemistry of Cement IUPAC International Symposium on the Chemistry of Natural Products International Symposium on the Theory of Arch Dams International Symposium on the Reactivity of Solids (Poznan)IUPAC International Symposium on the Chemistry of Natural Products (Manila)International Symposium on Remote Sensing of Environment (Dijon,France)International Symposium on the Reactivity of Solids