This memorandum is the result of an investigation into the three existing biomedical information services; MEDLARS (Medical Literature Analysis and Retrieval System), the interlibrary loan (ILL) service, and the network of Poison Control Centers. This research is intended to provide an understanding of the structure, quality, and coverage of these services, prior to the conceptualization and design of systems that may provide similar types of information. In addition, an attempt is made to design a computer-based system that could provide the services investigated. This treatment is stylized and functional rather than operational: the primary objective is to determine how the various functions may be automated, rather than to define specific hardware, communications systems, and manpower resources are necessary for implementation. The cost data included are thus superficial and are included only to provide a basis for comparing various means of dissemination. (Author)