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Hi Elizabeth

Here's the marriage from the IGI:

Name: Robert Casement
Event Type: Marriage
Event Date: 12 Sep 1840
Event Place: Lonan, Isle of Man
Gender: Male
Marital Status:
Father's Name: John Casement
Mother's Name:
Spouse's Name: Agnes Thompson
Spouse's Marital Status:
Spouse's Father's Name: Wm Thompson
Spouse's Mother's Name:
Digital Folder Number: 004497487
Image Number: 00016

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Jean C