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The INDEX OF MARYLAND COLONIAL WILLS 1634-1777 IN THE HALL OF RECORDS, ANNAPOLIS, MARYLAND, compiled by James M. Magruder, Jr., Genealogical Publishing Co., Inc., Baltimore 1975, originally printed 1933, at page 135 reports:
1711 Dossett, John Prince George's County, Book 13, Page/folio 274.
If anyone has access to this Will, it would be interesting to see if he identified a spouse and children.