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Osborn, H. ((Hrsg.)) 1937: Fragments of Entomological History Including Some Personal Recollections of Men and Events. 1 Columbus, Ohio, Published by the Author, 1-394 S., 6024, pp. 266
Reid, R. W. 1974: [Hopping, G. R.] The Bulletin of the Entomological Society of Canada = Le Bulletin de la Société d'Entomologie de Canada, Ottawa 6 (3), S. 96, B15: 11766