Letters of J. C. KapteynThe Dutch astronomer J. C. Kapteyn (1851 - 1922) had an active correspondence with two Finnish astronomers, A. Donner and R. Furuhjelm. These letters, archived at the University of Helsinki Observatory, have been digitized in 2002. See also: |
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University of Helsinki |
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Letters scanned in June 2002 by Paavo Piironen
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