A review is made of the possible applications within the libraries of the City of London Polytechnic of the three basic types of microforms--microfilm, microfiche, and microopaques. Major uses outlined involve: 1) the exploitation of existing data bases; 2) the storage of back issues of periodicals; 3) the presentation of programed instruction; 4) the development of a machine-based library catalog; 5) the dissemination of material for correspondence courses; 6) the development of special collections and archives; and 7) the creation of a slide collection of art materials. The conclusion is reached that microforms are an inexpensive, flexible means of storing large quantities of materials in small areas. Given the increaseing trend toward the availability of microforms and the decreasing resistance to them by users, it is recommended that the Polytechnic's Library and Learning Resources Service begin to acquire microforms of major periodical runs and special collections and to invest in the necessary equipment. (PB)