Information on library networks that was included in a survey conducted by the Center for Education Statistics--the "Survey of Library Networks and Cooperative Library Organizations: 1985-1986"--indicates that there were 760 library networks at that time, with aggregate library membership estimated to be 76,280. Over three-fourths of the networks were based on written agreements signed by each member. Services provided to network members came from three different sources: the network headquarters, the members themselves (to each other), and external sources such as vendors or consultants. The network headquarters provided a variety of services, while the most important services provided by the members was interlibrary loan (53%), and by external sources or contractors, catalog production (29%). The number of paid library network staff members was 9,845, with the average number of staff per network at 13. Library networks received $656 million in 1985-86, or an average of $863,000 per network, and spent $490 million, or an average of $642,000 per network. Federal grants amounted to 9% of all funds received, with federal, state, and local funds representing 36% of funds received by networks. (EW)