Question: When was the library, at which John Metcalfe was the principal librarian in 1950, established ?
Sentence (from "John Metcalfe (librarian)"): He was the Principal Librarian at the Public Library of New South Wales (now State Library of New South Wales) from 1942 until 1958 and University Librarian at the University of New South Wales from 1959–1966.
Relevant evidence: Yes