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Manx Genealogy

John Mylchreest / Catharine Cowin

Can anybody give me any information on John Mylchreest and Catharine Cowin who married 7 Aug 1836. I am looking for the births of these two and also any census they would be on. Their date of death would also be of interest. I have some information but I would just like to confirm what I have.
Many Thanks
Eric Price