Columbia subject headings:
Harvard subject headings:
Canada--Description and travel.
Lewin, Louis, 1850-1929.
Lewin, Louis.
Pharmacologists--Biography.
Pharmacologists--Correspondence.
United States--Description and travel.
Princeton subject headings:
Canada--Description and travel.
Lewin, Louis, 1850-1929.
Pharmacologists--Germany--Correspondence, reminiscences, etc.
United States--Description and travel.