Handlist of correspondence of William Wentworth Fitzwilliam, 4th Earl Fitzwilliam (d. 1833).
Great Britain.Royal Commission on Historical Manuscripts.
Great Britain.National Register of Archives.
[London?] : [Royal Commission on Historical Manuscripts : National Register of Archives],
[1971?]
"(volume 2. April 1807 - 1832 inclusive and updated letters to which no date has been assigned)."