Columbia subject headings:
Harvard subject headings:
Wales--Church history--Sources.
Wales--History--1063-1536--Sources.
Ystrad Marchell Abbey (Welshpool, Wales)--Charters.
Ystrad Marchell Abbey (Welshpool, Wales)--History--Sources.
Princeton subject headings:
Wales--Church history--Sources.
Wales--History--1063-1536--Sources.
Ystrad Marchell Abbey (Welshpool, Wales)--Charters.
Ystrad Marchell Abbey (Welshpool, Wales)--History--Sources.