Columbia subject headings:
Harvard subject headings:
Botanists--Denmark--Biography.
Botanists--India--Kolkata--Biography.
Botany--History--19th century.
Danes--India--Kolkata--Biography.
Wallich, N. (Nathaniel), 1786-1854--Travel--India--Kolkata.
Wallich, N. (Nathaniel), 1786-1854.
Princeton subject headings:
Botanists--Denmark--Biography.
Botany--History.
Wallich, N. (Nathaniel), 1786-1854.