Abraham Lincoln

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Abraham Lincoln
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Use of theodolite. 1833-35
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1857 Almanac
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(No Transcript)
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US Naval Observatory
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Robert Todd Lincoln
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RTL Observatory
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RTL Telescope
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Edward Swift Isham
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Ralph N. Isham
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Mary Lincoln IshamLincoln Isham
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George Eliot Hale
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Yerkes Observatory Group- 1900 Solar Eclipse
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George Snow Isham
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Snow Telescope