AMER STD 0: McQuade Research Group

A sampling of relevant web pages available on the free Internet (as opposed to library databases):

Library of Congress:  Patent medicine labels and advertisements

Prints and Photographs Division:  search results "patent medicine advertisements"
American Memory Advertising collections (try searching; also browse by subject)

UCLA Biomedical Library:  Patent Medicine Trade Cards

Eskind Biomedical Library (Vanderbilt University) online exhibit

Hagley Museum and Library (Delaware) online exhibit

National Library of Medicine:  Images from the History of Medicine

Library of Congress:  historical newspaper articles about patent medicines