title: Analytical chemists on postage stamps.
mesh_terms: D056246:Chemistry, Analytic / Q000266:history*; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006686:Hobbies; D010678:Philately / Q000266:history*