Columbia subject headings:
Fuller's earth--Great Britain--History.
Fuller's earth--History.
Montmorillonite--Great Britain.
Woolen and worsted finishing--History.
Harvard subject headings:
Calcium montmorillonite.
Fuller's earth--History.
Fuller's earth.
Montmorillonite.
Princeton subject headings:
Fuller's earth--Great Britain--History.
Fuller's earth--History.
Montmorillonite--Great Britain.
Woolen and worsted finishing--History.