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The Deputy Keeper of the Records. Calendar of Inquisitions Post Mortem, Vol. III...
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The Deputy Keeper of the Records. Calendar of Inquisitions Post Mortem, Vol. III, Edward I, (London: His Majesty's Principal Secretary of State for the Home Department, 1912). Online at Archive.org, pages 223-224: Abstract 363 - Helen (Elena) la Zousche.