Again, May 22 is the International Day for Biological Diversity. Postcard US-3971360 to Japan shows various cacti and desert flora of the Great Southwest.
USPS issued the Sonoran Desert sheet in Tucson, Arizona on April 6, 1999 that contained ten 33¢ stamps. It was the first of twelve self-adhesive stamp sheets Nature of America that USPS released annually between 1999 and 2010.
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