title: Patrick Henry Costello 1897-1971: architect of reciprocal standards.
authors.affiliation: Lloyd Library and Museum, Cincinnati, OH, USA.
authors.forename: Dennis B
authors.initials: DB
authors.lastname: Worthen
mesh_terms: D000077406:History of Pharmacy; D049673:History, 20th Century; D008009:Licensure, Pharmacy / Q000592:standards*; D014481:United States