Columbia subject headings:
Historic buildings--Conservation and restoration--England--History--20th century.
Historic buildings--Conservation and restoration--Wales--History--20th century.
Historic preservation--England--History--20th century.
Historic preservation--Wales--History--20th century.
Historic sites--Conservation and restoration--England--History--20th century.
Historic sites--Conservation and restoration--Wales--History--20th century.
Nature conservation--England--History--20th century.
Nature conservation--Wales--History--20th century.
Harvard subject headings:
Historic buildings--Conservation and restoration--England--History--20th century.
Historic buildings--Conservation and restoration--Wales--History--20th century.
Historic preservation--England--History--20th century.
Historic preservation--Wales--History--20th century.
Historic sites--Conservation and restoration--England--History--20th century.
Historic sites--Conservation and restoration--Wales--History--20th century.
National Trust (Great Britain)--History.
Nature conservation--England--History--20th century.
Nature conservation--Wales--History--20th century.
Princeton subject headings:
Historic buildings--England--Conservation and restoration--History--20th century.
Historic buildings--Wales--Conservation and restoration--History--20th century.
Historic preservation--England--History--20th century.
Historic preservation--Wales--History--20th century.
Historic sites--England--Conservation and restoration--History--20th century.
Historic sites--Wales--Conservation and restoration--History--20th century.
National Trust (Great Britain)--History.
Nature conservation--England--History--20th century.
Nature conservation--Wales--History--20th century.