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Bentinck, Margaret Cavendish [Lady Margaret Cavendish Harley], duchess of Portland

Margaret Cavendish Bentinck [Lady Margaret Cavendish Harley], duchess of Portland (1715–1785)

by Joseph Brown, pubd 1861 (after Christian Friedrich Zincke, 1738)

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Historical Manuscripts Commission
H. Walpole, ed. W. S. Lewis & others, 48 vols. (1937–83)