Природный немец, родом пруссак, отдавший всю жизнь России» / "Natural German native Prussian, ...> who gave a lifetime of Russia"
Mikhail Choref
Materialy po arheologii i istorii antičnogo i srednevekovogo Kryma, 2011-12, Vol.3, p.5-8 [Periódico revisado por pares]Nizhnevartovsk State University
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