In Owiesno there is St Trinity church which is part of St Hedwiga parish where all the Regisrty Books (concerning Births, Marriages and Deaths) suppose to be. Copies of this documantation suppose to be in Swidnica Diocesan Archive.
It all depands on what exact information you would like to obtain. Once you will let me know I'm sure I could help you.
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Good luck in your researches anyway!