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U. S. Astronaut, Retired. STEM Ambassador, Social Media Advocate, NASA Supporter and inventor of the Twitpic Pic of the Day! (POTD)
358 days ago
Second POTD since i did a #RR last time! Sorry!
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NASA says „Copper mines“. My details: the Pima Mine in Sahuarita, AZ, 32.000215,-110.999502, a few miles south of Tucson.
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