Central Opera Service bulletin.

v.8 no.5 1966; v.10 no.2 1967; v.10 Sept. 1967-June 1968; v.11 Sept. 1968-June 1969; v.12 no.2 1969; v.9-12 1966-1970; v.12 Sept. 1969-June 1970; v.13 Sept. 1970-June 1971; v.15 Fall 1972-Summer 1973; v.13-16 1970/1974; v.16 Fall 1973-Summer 1974; v.16 no.2 Winter 1973/1974; v.17 Fall 1974-Summer 1975; v.18 Fall 1975-Summer 1976; v.18 no.4 1976; v.19 1976; v.19 Fall 1976-Summer 1977; v.20 Winter 1977-Fall 1978; v.20 no.1-2 1977/1978; v.21-22 Winter 1978-Spring 1; v.21 1979; v.22 1980/1981; v.22 no.1; v.22 no.3; v.22 no.4; v.23 1981/1982; v.23 Summer 1981-Spring 1982; v.23 no.1; v.23 no.3; v.23 no.4; v.24 no.1; v.24 no.1-3 Summer 1982-Summ; v.24 1983/1984; v.24 no.2; v.24 no.3; v.24 no.4 1984; v.25 1983/1985; v.25 1984/1985; v.25 no.1; v.25 no.2; v.25 no.3; v.26 1985; v.26 1984/1986; v.26 no.1-2; v.26 no.3; v.26 no.4; v.27 1986/1987; v.27 Spring 1986-Summer 1987; v.27 no.2; v.27 no.3; v.27 no.4; v.28 1987/1988; v.28 Fall 1987-Summer 1988; v.28 no.4; v.29 1988/1990; v.29 Fall 1988-Winter 1990; v.29 no.1-2; v.29 no.3; v.29 no.4; v.30 1990; v.30 no.1 Spring 1990; v.30 no.2-4 1990; SUPPL:1978