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Gain a lifetime of experience from the inventor of test marketing and coupon sampling -- Claude C. Hopkins. Here, you'll get two landmark works in one, and discover his fixed principles and basic fundamentals that still prevail today.
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Gain a lifetime of experience from the inventor of test marketing and coupon sampling -- Claude C. Hopkins. Here, you'll get two landmark works in one, and discover his fixed principles and basic fundamentals that still p...
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