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Zilczer, J.  (2000, February). Hirshhorn, Joseph H. (11 August 1899?–31 August 1981), financier and art collector. American National Biography.  Retrieved 26 May. 2019, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1701402.