000K  utf8
1500  ger
4000  Letter from the Ambassador to Poland, [Count Hermann Karl von] Keyserling, to [the Russian Minister Plenipotentiary to London, Prince Antiochus] Cantemir, regarding sending documents and his appointment to Warsaw
4000  Письмо посла в Польше Кейзерлинга Кантемиру о препровождении документов, о своем назначении в Варшаву
4961  https://ditav.gbv.de/receive/lod_mods_00000318