Alfred Copeland Callen
Alfred Copeland Callen, American mining engineer Member American Institute Mining and Metallurgical Engineers (chairman mineral industry education division 1944), Mining and Metallurgical Society of America, Illinois Mining Institute (president 1930), American Society Engineering Education (member of council 1941-1944), Theta Delta Chi, Tau Beta Pl, Sigma Xi, Omicron Delta Kappa. Pi Tau Sigma.; Mason (Knight of the Order of the Thistle, 33°).
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