000K  utf8
1500  fre
1500  rus
4000  Letters from [the Vice-Chancellor of Russia, Heinrich Johann Friedrich] Ostermann, to [the Russian Minister Plenipotentiary to Great Britain, Prince Antiouchus] Cantemir, regarding the pruchase of mathematics textbooks
4000  Письма Остермана Кантемиру о покупке учебных пособий по математике
4961  https://ditav.gbv.de/receive/lod_mods_00000355