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| Title | Letter MARykacheva P.A.Valuevo about his stay and work in the Greenwich Magnetic and Meteorological Observatory (England) and with the application description of the barrogram and thermograph Greenwich Observatory |
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| Series | Archive of Count Petr Aleksandrovich Valuev |
| Fonds | Valuev Petr Alexandrovich, Earl (1814-1890). Minister of Internal Affairs, Minister of State Property, Chairman of the Committee of Ministers, member of the Council of State |
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