Organisation
American Topical Association
Catalogue
- Books
Medicine tax stamps: worldwide / by George Griffenhagen.
Griffenhagen, George B.Date: [1971]- Books
Medical history in philately / Gerhard J. Newerla ; cover by R.S. Oesch.
Newerla, Gerhard J. (Gerhard Joseph), 1906-Date: [1964], ©1964- Books
Pharmaceutical philately / by George Griffenhagen.
Griffenhagen, George B.Date: [1990], ©1990