000K  utf8
1500  fre
4000  Letters [from the Secretary to the Russian Embassy in Constantinople, Ivan Iakovlevich Iakovlev,] to [the Russian Envoy Extraordinary and Minister Plenipotentiary to the Ottoman Porte,] Iakov Ivanovich Bulgakov
4000  Письма к Булгакову, Якову Ивановичу
4060  21
4961  https://ditav.gbv.de/receive/lod_mods_00000861