Research bulletin.

no.1-8; no.1 1972; no.2 1973; no.3 1974; no.4 1975; no.5 1976; no.6 1976; no.7 1976; no.8 1976; no.9; no.10 pt.1 197; no.10 pt.2 197; no.10 pt.3 197; no.10 pt.4 1978; no.10 pt.5 1978; no.11-20; no.12 1978; no.13; no.14 1979; no.15; no.17 1980; no.18 1980; no.19 1981; no.21-25; no.21 1981; no.23 1982; no.24 1982; no.28 1983; no.29 1983; no.30 1983; no.31 1983; no.32; no.33 1984; no.34; no.47b; no.47; no.47 1985; no.42 1986; no.37 1987; no.38 1987; no.40 1987; no.41 1987; no.42 pt.2 1987; no.43 1987; no.44 1987; no.45 1988; no.48 1988; no.46 1989; no.39 1990; no.49 1990; no.50 1990; no.47-B 1991; no.53 1991; no.52 1993; no.65 (1996); no.67 (1997)