 It acquired four other firms since the beginning of 1997, including Medical Marketing Detailing Inc., a New York-based provider of pharmaceutical marketing services; American List Corp. of Mineola, New York, which maintains a database of more than 30 million students that it rents to direct mail and telemarketing companies;fair Neighbor Direct, which provides marketing services for clients in 5,000 retail outlets; and Brann Holding Ltd., a British direct marketing company.On an organic basis, SNC's revenue nearly doubled between 1995 and 1996 to $82.8 million.Medical Marketing Detailing itself had revenue of about $35 million in its fiscal year ended in October.