RT @USGS: 4/28/1928: Gene Shoemaker, USGS Astrogeology founder & famed astro-geologist born. on.doi.gov/1kec34Y https://t.co/74uZyFXdNF
RT @USGS: 4/28/1928: Gene Shoemaker, USGS Astrogeology founder & famed astro-geologist born. on.doi.gov/1kec34Y https://t.co/74uZyFXdNF