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Frederik Wellmann
A. MS.
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Coast Survey (United States), Geodesy (see also Coast Survey), Light and Luminosity and metre bar, wavelength of Light, Metrology l (see also Coast Survey)
pp. 1-7 plus single page (A1), an insert to p. 7, a variant p. 6, and a single unnumbered page.
1879~
MS1073_006
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c. 1879