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The Xe 129 NMR method has been applied to the ammonium and cesium salts of 12-tungstophosphoric, 12-molybdophosphoric, and 12-tungstosilicic acids, as well as to the potassium salt of the first acid. The data obtained provide evidence for the presence of a homogeneous and organized pore structure. The ammonium salts produce similar pore openings of 9.0 Å, regardless of the composition of the...