I am researching these names too. John Kalwa and Mary Kozezemski are my great grandparents. I was born in St Louis. My grand mother was Mary Barbara Kalwa. Born 29 Jun 1891 in St Louis and died 29 Mar 1953 in St Louis. I have her death record and marriage license. She married Joseph Thomas Pielecki. Born 22 Jun 1892 (I believe in St Louis) and died in Jul of 1969 in St Louis. They had a daughter, Dolores Marie Pielecki (my mother) and a son Joseph Jay Pielecki (who was like a father to me).
Unfortunately, I do not have much else on my great grandparents (Kalwa) but Mary Barbara Kalwa's death certificate states her mother's name was KOZENSKI. Maybe the death certificate spelling is wrong.
I am glad to meet you.
Mark Gerard Lukitsch