Columbia subject headings:
Alkali industry and trade--North America--Early works to 1800.
Barilla.
Potash industry and trade--North America--Early works to 1800.
Potash.
Harvard subject headings:
Alkali industry and trade--Massachusetts--Early works to 1800.
Barilla.
Potash industry and trade--Massachusetts--Early works to 1800.
Potash.
Princeton subject headings: