title: 19th century dentistry advertising trade cards: no. 7.
authors.affiliation: Department of Pediatric Dentistry, University of Pennsylvania School of Dental Medicine, USA.
authors.forename: T P
authors.initials: TP
authors.lastname: Croll
authors.forename: B Z
authors.initials: BZ
authors.lastname: Swanson
mesh_terms: D000329:Advertising / Q000266:history*; D006665:History of Dentistry; D049672:History, 19th Century; D014481:United States