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Modern advertising : Calkins, Earnest Elmo, 1868-1964 : Free Download, Borrow, and Streaming : Internet Archive
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Earnest Elmo Calkins: Founder of Modern Advertising and a Designer You Probably Don't Know: Design Observer
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Earnest Calkins (March 25, 1868 — January 4, 1964), American author, advertising executive | World Biographical Encyclopedia
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Earnest Calkins (March 25, 1868 — January 4, 1964), American author, advertising executive | World Biographical Encyclopedia
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