Signos.

no.1-3 1969; v.1 (1969-70); no.4 1970; v.2 (1970-71); no.5-7 1971; v.3 (1971-72); no.8-10 1972; v.4 (1972-73); no.11-13 1973; v.5 (1973-74); no.14-16 1974-75; v.6 (1975); no.17-19 1976; v.7 (1976); no.20 1977; no.21 yr.1978; no.21-22 1978-79; no.23-26 1979-80; no.25; no.27 1981; no.28; no.28 1982; v.28-29 (1982); no.29; no.30 yr.1983; v.30-31 (1983); no.31,33 1983-84; v.32-33 (1984); v.34-35 (1985); no.32; no.35-36 1985-88; no.36 yr.1988; v.36-38 (1988-89); no.37 yr.1989; no.37-39 1989-90; v.39 (Jan-June 1990); no.41 1995; no.42-43 1996; v.44 (1999); v.45 (2000); v.49 (2004)