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# 1912 - 1981 18¢ Space Achievement Issue-Exploring The Moon
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# 1913 - 1981 18¢ Space Achievement Issue-Benefiting Mankind 1
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# 1914 - 1981 18¢ Space Achievement Issue-Benefiting Mankind 2
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# 1915 - 1981 18¢ Space Achievement Issue-Understanding the Sun
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# 1916 - 1981 18¢ Space Achievement Issue-Probing the Planets
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# 1917 - 1981 18¢ Space Achievement Issue-Benefiting Mankind 3
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# 1918 - 1981 18¢ Space Achievement Issue-Benefiting Mankind 4
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# 1919 - 1981 18¢ Space Achievement Issue-Comprehending the Universe
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# 1927 - 1981 18¢ Alcoholism
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# 1942 - 1981 20¢ Desert Plnts, Barrel Cactus
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# 1943 - 1981 20¢ Desert Plants, Agave
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# 1944 - 1981 20¢ Desert Plants, Beavertail Cactus
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# 1945 - 1981 20¢ Desert Plants, Saguaro
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