Boletim mensal /

v.17:no.6 (1981:June)-v.18:no.1 (1982:Jan.),Some issues bound with earlier title, v.18:no.3 (1982:Mar.)-v.19:no.10 (1983:Oct.),v.20:no.4 (1984:Apr.)-v.20:no.10 (1984:Oct.),v.20:no.12 (1984:Dec.)-v.21:no.4 (1985:Apr.),v.21:no.6 (1985:June),v.21:no.10 (1985:Oct.)-v.22:no.9 (1986:Sept.),v.23:no.1 (1987:Jan.)-v.24:no.4 (1988:Apr.),v.25:no.3 (1989:Mar.)-v.25:no.6 (1989:June),v.25:no.9 (1989:Sept.)-v.25:no.12 (1989:Dec.),v.27:no.1 (1991:Jan.)-v.28:no.10/12 (1992:Oct./Dec.), Supplements: v.21:no.6 (1985:June); "separata" 1985:June,1986:Jan./Feb., 1986:Apr.-1986:May/June, 1986:Sept.,1987:Jan./Feb., 1987:May, 1987:Oct./Nov.-1987:Dec.;, 1988:Mar.-1988:Apr.,1989:Mar., 1989:Dec.;, 1991:Jan.-1991:Feb., 1991:Apr., 1991:June-1981:July, 1981:Sept.,1992:Jan., 1992:Apr., 1992:July