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Reductions of Wills' astronomical observations made by Edwin Welch. Bilbarker [sic], Camp 30, 3rd & 4th October 1860. 18p. ms.

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Reductions of Wills' astronomical observations made by Edwin Welch. Bilbarker [sic], Camp 30, 3rd & 4th October 1860. 18p. ms.
Reductions of Wills' astronomical observations made by Edwin Welch. Bilbarker [sic], Camp 30, 3rd & 4th October 1860. 18p. ms.