A case study of the Suburban Library System (SLS) was conducted by applying an analytical library network model to data collected during March 1978. Models are developed for describing the intralibrary processing activities encountered at SLS and the other resource libraries in this case study. Alternative routing policies for referring requests among resource libraries are generated as a function of probability of satisfaction and waiting time. Constraints on the order of resource libraries in a referral route are also considered in generating alternative policies. Recommendations suggest specific changes in the reserve and purchase procedures at SLS which are predicted to improve overall network performance. (Author)