Market Data Systems carries information from 13 commodity exchanges for the benefit of customers. It leases terminals on which to receive the information. ADDRESS: Market Data Systems, Inc. 3835 lamar Ave. Memphis, TN 38118 =19. NEMA (National Electronic Marketing Association, Inc.)= NEMA offers marketing firms computerized marketing systems for many agricultural products. It is a way of linking buyers and sellers without having to first transport the products to market. Electronic marketing enables buyers and sellers to negotiate transactions in a public market while remaining in their own offices. NEMA is developing several marketing systems for agricultural markets. NEMA was developed by Virginia Tech Extension and Research staff in cooperation with the Virginia Department of Agriculture and Commerce and AMS. Through a telephone hookup to computer terminals in any location, buyers and sellers are brought together at a specific time to determine the price, on a competitive basis, for the products being offered for sale. Prospective buyers can obtain written descriptions of the products before sale time. One pricing technique is a computerized auction process, where the computer acts as the auctioneer. During the auction, the computer drops the asking price until a bid is received, then raises the price from that point until there is only one bidder left. At the end of a sale, the highest bidders receive summaries of their purchases. The products are shipped efficiently from seller to buyer. State Cooperative Extension Services, producers' organizations. State departments of agriculture, and other agencies have developed and implemented NEMA, as well as some other electronic marketing systems in the United States. Today computerized systems sell slaughter and feeder livestock, cotton, and shell eggs. This system is for market agents and buyers. ADDRESS: National Electronic Marketing Assn., Inc. P.O. Box 722 Christiansburg, VA 24073 =20. NPIRS (National Pesticide Information Retrieval System)= NPIRS is a nationally accessible online data base containing information about all pesticides registered with the Environmental Protection Agency, and indicating which are registered for use against specific pests on specific crops or sites. States can also insert information about State pesticide registrations. Purdue University is developing the system under a cooperative agreement with USDA and is managing the data base, which uses facilities provided by Martin-Marietta, Inc. ADDRESS: National Pesticide Information Retrieval System Entomology Hall Purdue University West Lafayette, IN 47907 =21. Rural Ventures=