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John F. McCauley 1932-2012  (Art.-No.: 28737 ) 

signed First Day Cover (FDC), 3.5x6.5 inch 
Product description:
He was an eminent scientist in Menlo Park, California and Flagstaff, Arizona, where he led pioneering research in geology of the Earth’s deserts, the Moon, Mercury and Mars.  
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John F. McCauley 1932-2012