Die Methode gleicher Zenitdistanzen symmetrisch zum ersten Vertikal und ihre Anwendung zur Bestimmung der Polhöhe von Dorpat im Frühjahr 1909
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URL: http://www.digar.ee/id/nlib-digar:946716
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URL: http://www.digar.ee/id/nlib-digar:946716
