Columbia subject headings:
Fitzwilliam, William Fitzwilliam, Earl, 1643-1719--Correspondence.
Guybon, Francis--Correspondence.
Nobility--Great Britain--Correspondence.
Harvard subject headings:
Administration of estates--England--Northamptonshire--History--18th century--Sources.
Fitzwilliam, William Fitzwilliam, Earl, 1643-1719--Correspondence.
Guybon, Francis--Correspondence.
Landowners--England--Northamptonshire--Correspondence.
Northamptonshire (England)--History--Sources.
Princeton subject headings:
Fitzwilliam, William, Earl, 1643-1719--Correspondence.
Guybon, Francis--Correspondence.
Nobility--Great Britain--Correspondence.