J. Walter Thompson Company. Diamond Information Center.
The J. Walter Thompson Company (JWT), founded in 1864, is one of the largest and oldest advertising agencies in the United States. The Diamond Information Center (DIC) operates as the public relations division of the diamond marketing group at J. Walter Thompson on behalf of De Beers Consolidated Mines, Ltd. It is located in New York City.
From the description of Diamond Information Center Vertical files, 1930s -1980s. (Duke University Library). WorldCat record id: 686780333
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