The transfer of information through space and time in communication systems is often accompanied by significant delays which give rise to meaningful storage problems. Mathematical models have been developed for the study of these kinds of problems which are applicable to the design of manual, library-type, or mechanized information storage and retrieval systems. This state-of-the-art review of such models divides the subject into three kinds of storage models: those concerned primarily with spatial efficiency, those concerned with usage and cost, and those concerned with retrieval accuracy. (Author)