RGO Archives/RGO 61 contains:
1	Directions for the zenith telescope
2	Observations for latitude
3	Observations for latitude
4	Observations for latitude
5	Observations for latitude
6	Observations for latitude
7	Observations for latitude
8	Observations for latitude
9	Observations for latitude
10	Observations for latitude
11	Observations for latitude
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More information

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Papers of the North American Boundary Commission

Content and context

Observations made at the Swehl-tcha Station with the zenith telescope to determine latitude.

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