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| Tom and Jennifer Polakis | profile | all galleries >> 2019 >> Washington DC -- October 2019 >> U.S. Naval Observatory | tree view | thumbnails | slideshow |
 26" Dome |
 With Geoff Chester |
 USNO 26" Observatory Floor Elevation |
 With Geoff Chester and Dan Ward |
 Geoff Chester and 12" |
 12" |
 12" |
 Library |
 Copernicus book |
 Asaph Hall's original Mars moons notes |
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