Historical Manuscripts Commission
'Report of the Manuscripts of his Grace the Duke of Portland, K.G., preserved at Welbeck Abbey', Historical Manuscripts Commission, (hereafter, Portland), vol. 4, London, 1901
- Houses
- Castle Howard
'Report of the Manuscripts of his Grace the Duke of Portland, K.G., preserved at Welbeck Abbey', Historical Manuscripts Commission, (hereafter, Portland), vol. 4, London, 1901
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