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| Description |
Rykchev, Mikhail Alexandrovich (1840 / 41-1919).The historical essay of the main physical observatory over 50 years of its activity.1849-1899 / Sost.Dir.Observatory Acad.M. Rykachev.- St. Petersburg: Type.Imp.Acad.science- 28 cm. -.I. Main Physical Observatory.1.People (collection).Electronic Source: PBPlace of Storage Original: RGO
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| Publisher | тип. Имп. Акад. наук |