| Most viewed - 2013-09-19 Russian River Cruise |
In the background is the Church of Our Savior on the Spilled Blood.86 views
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86 views
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86 views
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86 views
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Ivan Georgievich Petrovsky (also Petrovskii), a Soviet mathematician in the field of partial differential equations. He greatly contributed to solution of Hilbert's 19th and 16th problems.86 views
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Entering the Hermitage Museum85 views
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The Return of the Prodigal Son (1663/1665) by Rembrant Harmensz. van Rijn (1606-1669)85 views
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85 views
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85 views
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85 views
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85 views
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