The last of four volumes in a series describing the basic documentation practices involved in the initial setting up and subsequent operation of an information-library organization to provide defense-aerospace scientific and technical information services, this manual consists of three sections. In "Security Storage and Control," Michael Sims describes the organization and administration of the security arrangements in a documentation center, and discusses the need for both physical and personnel security; security requirements for documents from the publication stage through final disposal and for items in various formats; and protection required in peripheral areas, e.g., reprographic and computer rooms. "Organisation and Management," by Diana Leitch, discusses the establishment of a technical information center; its aims and objectives; identification and fulfillment of user requirements; management and planning; the role of the staff; budget management; stock control; the impact of mechanization; and promotion of the center's services. "Networks and External Sources of Information," by Philip Eckert and others, reviews the basic functional aspects of telecommunications, text searching, and networking. Some commercial and non-commercial information networks operational in the U.S. and Europe are described, and details of services offered and contact points are provided for selected external online bibliographic databases on specific topics. (RAA)