Safe Operation of On-Farm Augers, Sammy Sadaka, Ph.D., P.E., P. Eng. Assistant Professor, Extension Engineer Wilmer T. McGraw, M.S. Former Director, Center of Excellence, Renewable Energy Technology Education, Phillips Community College, University of Arkansas https://www.uaex.uada.edu/publications/pdf/FSA-1079.pdf
Mead M. Hubby (1980): "Post Hole Auger". US patent 233,931, conceded November 2, 1880. Reproduced on the website Portal to Texas History; accessed on 2021-01-23.