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Published on .

[chicago] Questionnaires for the Advertising Age 100 Leading Research Companies Special Report were mailed late last month and should be returned by April 13.

Research companies are ranked by their gross revenue from U.S. research activity. The Special Report will be published May 25.

Questionnaires can be obtained from Research Editor Susen Taras in the Chicago office at (312) 649-5413.

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