Columbia subject headings:
Great Britain--History--Tudors, 1485-1603--Sources.
Harvard subject headings:
Ancaster, Gilbert Henry Heathcote-Drummond-Willoughby, 1st Earl of, 1830-1910--Manuscripts.
Great Britain--History--Tudors, 1485-1603--Sources.
Manuscripts, English--Great Britain.
Princeton subject headings:
Great Britain--History--Tudors, 1485-1603--Sources.