Serial. Printed Ephemera Collection has: 1964:Apr.1-1964:Nov.1, 1965:Jan.1, 1965:Apr.1-1965:Nov.1, 1966:May 1-1966:June 1, 1966:Aug.1-1966:Nov.1, 1967:Jan.1, 1967:Apr.1-1967:May 1, 1967:Aug.1-1967:Nov.1, 1968:Apr. 1-1968:June 1, 1968:Aug.12, 1968:Sept.12, 1968:Oct.1-1968:Nov.1, 1969:Apr.1-1969:May 1, 1969:June 12, 1969:Aug.13, 1969:Sept.15, 1969:Oct.14, 1969:Nov.17, 1970:Apr.1-1970:May 1, 1970:June 11, 1970:July 1-1970:Aug.1, 1970:Oct.13, 1971:Apr.1-1971:Nov.1, 1972:Apr.1-1972:June 1, 1972:Aug.1-1972:Nov.1, 1973:Apr.1-1973:Nov.1, 1974:Apr.1-1974:Oct.1, 1974:Nov.11, 1975:Apr.1-1975:Oct.1, 1975:Nov.13, 1976:May 1-1976:Sept.1, 1976:Nov.15, 1977:May 1-1977:June 1.