How to prove residence in Warszaw at 1936-1938 period ? #poland

Anita Hasson

I'am wondering how could I prove,
that my father lived in Warszaw before the war,
at-least in the period of 1936-1938?

Is there any Cenzus of Warszaw inhabitants
by that time - or any administrative list to check?
(No private phone on their name by that time).

Thanking in advance for good advice -
Anita Hasson (Kagan),

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