Columbia subject headings:
Harvard subject headings:
Biographies
Jonas, Johann Christian, 1765-1834
Medical geography--Germany--Monschau--History--18th century.
Medical geography--Germany--Monschau--History--19th century.
Medicine--Germany--Monschau--History--18th century.
Medicine--Germany--Monschau--History--19th century.
Physicians--Germany--Biography
Princeton subject headings:
Jonas, Johann Christian, 1765-1834.
Medical geography--Germany--Monschau.
Physicians--Germany--Biography.