000K  utf8
4000  Letters [from the Secretary of the Russian Embassy in Berlin, Secretary of the Russian Embassy to Venice, Schneyder] to [the Councillor of the Russian Embassy in Warsaw, Russian Envoy Extraordinary and Minister Plenipotentiary to the Ottoman Porte, Active State Councillor] Iakov Ivanovich Bulgakov
4000  Письма к Булгакову, Якову Ивановичу
4060  8
4961  https://ditav.gbv.de/receive/lod_mods_00000858