Description Market Data Retrieval (MDR) can educate you about the education business. A business segment of business information giant Dun & Bradstreet (also the parent of Hoover's), the company provides a wide range of marketing information about the educational industry including school directories, mailing lists (both electronic and snail mail), and statistical reports. MDR's information is used by its customers for the purposes of direct marketing, telemarketing, market research, and product development. The firm's database contains about 5 million contacts at about 260,000 preschool to college institutions.