title: Retrieval of primary sources.
authors.forename: J A
authors.initials: JA
authors.lastname: Popplestone
mesh_terms: D006663:Historiography; D006666:History of Medicine; D049711:History, Modern 1601-; D007990:Libraries / Q000266:history*; D011584:Psychology / Q000266:history*; D014481:United States