Columbia subject headings:
Great Britain--History--Edward I, 1272-1307--Sources.
Great Britain--Politics and government--1154-1399.
Harvard subject headings:
Great Britain--History--Edward I, 1272-1307--Sources.
Great Britain--Politics and government--1154-1399.
Princeton subject headings:
Great Britain--History--Edward I, 1272-1307--Sources.
Great Britain--Politics and government--1154-1399.