About Dmitry Polyakov
In the article quoted under the Source tab, the date birth is "03.22.1883". The article uses European notation for dates, with day preceding month, so it is an obvious typo, as there are only 12 months, not 22.
Most probably, the date should be February 03, 1883. However, Russia used Julian calendar before 1918. The date of birth is February 15 in Gregorian calendar. The date of birth February 16 in three attached documents most likely because 13 days were wrongly added instead of 12 days that should be added for dates in XIX century.