Columbia subject headings:
Harvard subject headings:
Eau de Cologne
Klösterfrau Melissengeist--History.
Martin, Maria Clementine, 1775-1843.
Nuns--Belgium--Brussels--Biography.
Princeton subject headings:
Heckelmann, Helmut,
Martin, Maria Clementine. 1775-1843.
Medicinal plants--History--19th century.
Nuns--Germany--Cologne--Biography.
Traditional medicine--History--19th century.
Women inventors--Germany--Cologne--Biography.