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4. Association of Public & Land-Grant Universities, Public impact research: Engaged universities making the difference. https://www.aplu.org/library/public-impact-research-engaged-universities-making-the-difference/file. Accessed 3 January 2020.
5. F. M. Reck , The 4-H Story: A History of 4-H Club Work (Iowa State University Press, Ames, IA, 1951).