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| Title | An explanatory note to the project of the Ertil Railway branch of Prince Vladimir Nikolayevich Orlov and a note on the technical conditions of its construction |
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| Series | Orlovs, counts, subsequently princes |
| Fonds | Orlovs, princes: Alexey Fedorovich (1786-1861), chief gendarmes and chief chief of the III department of the E.I.V. Office, Chairman of the State Council and the Committee of Ministers;Nikolai Alekseevich (1827-1885), Messenger in Brussels, Ambassador to Paris |
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