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Bay, Helmuth (Personal Name)
The bowker lectures on book publishing : Second series, 1954. port. (Helmut Bay)
WWW VIAF, Dic. 16, 2016. Bay, Helmuth. http://viaf.org/viaf/90820297/#Bay,_Helmuth
WWW Duke University Libraries, Digital Collections, A tale of three maps, Dic. 16, 2016. Maps edited by Helmuth Bay (Rand McNally). http://library.duke.edu/digitalcollections/adaccess_T2385/
WWW Period Paper, A tale of three maps, Dic. 16, 2016. Maps edited by Helmuth Bay, map consultant for Rand McNally & Co. https://www.periodpaper.com/products/1944-ad-american-airlines-map-history-transportation-original-advertising-000938-aa-007