About 4839 references (v. 1, about 3000; v. 2, 1839), intended to trace development of production of low temperatures and to show its use in science and technology. V. 1 primarily covers period 1950-Dec., 1966; v. 2, 1966-1968. Classified arrangement. Each entry includes bibliographical citation, brief annotation, and usually a notation about the number of references cited and the time period covered by such references. Author, subject indexes.