Medicinal plant map of the United States of America, David Rumsey Map Collection, 1932. Author: National Wholesale Druggists' Association, Edwin Newcomb. Publisher: Einson-Freeman Co., Inc., New York.

Medicinal plant map of the United States of America, David Rumsey Map Collection, 1932. Author: National Wholesale Druggists’ Association, Edwin Newcomb. Publisher: Einson-Freeman Co., Inc., New York.

Medicinal plant map of the United States of America, David Rumsey Map Collection, 1932. Author: National Wholesale Druggists’ Association, Edwin Newcomb. Publisher: Einson-Freeman Co., Inc., New York.