An introduction to Sears List of subject headings / Philip R. D. Corrigan. Corrigan, Philip Richard D. Sears, Minnie Earl, 1873-1933. Sears list of subject headings. Subject headings Programmed instruction. 025.33 COI Hamden, Conn. : Archon Books, 1967. 1967. 1967 Text vii, 94 p. ; eng A Programmed text in library and information science