"Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced. "Mogao Grottoes (II)" special stamp artwork announced.