Dentistry on stamps.
Loevy
Hannelore T
HT
Kowitz
Aletha A
AA
D002133:Calcium Sulfate / Q000266:history*; D003764:Dental Materials / Q000266:history*; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D010678:Philately / Q000266:history*
D003764:Dental Materials; D002133:Calcium Sulfate