000K  utf8
1500  rus
4000  Letters [from the Secretary (?) to the Russian Embassy to Constantinople, Ivan Iakovlevich Iakovlev] to [the Russian Minister Plenipotentiary to Warsaw,] Iakov Ivanovich Bulgakov
4000  Письма к Булгакову, Якову Ивановичу
4060  25
4961  https://ditav.gbv.de/receive/lod_mods_00000863