I am trying to find some information on my g-grandfather, John Henry Koors (or Johann Heinrich) b.abt.1809 in Oldenburg, according to one of the census. He married a Mary or Maria Kalkmann. I don't know if it was before or after the immigration to USA. Their oldest child, Bernard was born in 1843 in Cincinatti, Ohio. Any help is appreciated.
Paula Redding