Problemas del desarrollo.

no.1-4 1969-1970; v.1 no.3-5 1970; no.5-8 1970-1971; v.2 no.8-9 1971; no.9-12 1971-1972; v.3 no.10-12 1972; v.4 no.13-14 1972-1973; no.13-16 1972-1974; v.4 no.15-16 1973-1974; v.5 no.17-20 1974-1975; no.21-24 1975; v.6 no.21-22 1975; v.6 no.23-24 1975-1976; no.25-28 1976; no.25-28 1976-77; v.7 no.25-28 1976-1977; no.29-32 1977; v.8 no.29-30 1977; v.8 no.31-32 1977-1978; no.22-26 1978; no.33-35 1978; v.9 no.33-34 1978; no.36,38-39 1978/79; v.9 no.35-36 1978-1979; no.37-40 1979; v.10 no.37-38 1979; v.10 no.39-40 1979-1980; no.41-42 1980; v.11 no.41-42 1980; no.41-44 1980-1981; no.43-44 1980-81; v.11 no.43-44 1980-1981; v.12 no.45 1981; no.45-48 1981-82; no.45-48 1981-1982; v.13 no.50-52 1982; no.49-52 1982-1983; v.14 no.53-56 1983; no.53-56 1983-1984; no.57 1984; no.57-59 1984; no.58-59 1984; v.15 no.57 1984; no.60 1984-85; no.60-63 1984-1985; v.15 no.57-60 1984-1985; v.15 no.58-60 1984-1985; v.16 no.61-63; v.16 no.61-63 1985; no.62-67 1985-86; no.64-67 1985-1986; v.17 no.64-67; v.17 no.64-67 1986; no.68-71 1987; v.18 no.68-71 1987; no.72-75 1988; v.18 no.69-71; v.19 no.72-75; v.19 no.72-74 1988; no.76-79 1989; no.80-82 1990; no.83 1990; no.84-87 1991; no.88-89 1992; no.90-91 1992; no.92-93 1993; no.93-95 1993; no.94-95 1993; no.96-97 1994; no.98-99 1994; no.99-101 1994-95; no.100-101 1995; no.102- 103 1995; no.105-107 1996; no.105-107 (Apr-Dec 1996); no.108-109 1997; no.110-111 1997; no.112-114 1998; no.114-117 1998-1999; no.115-116 1998-1999; no.115-117 (Oct 1998-June 1999); no.115-117 1999; no.118-119 1999; no.118-119 (July-Dec 1999); no.118-120 1999-2000; no.120-123 2000; v.20 no.76; v.20 no.77- v.21 no.80; v.21 no.81-83; v.22 no.84-87; v.23 no.88; v.23 no.89-91; v.24 no.92-94; v.24 no.95; v.25 no.96; v.25 no.97-99; v.26 no.100-101; v.26 no.102-103; v.27 no.104-105; v.27 no.106-107; v.28 no.108-111; v.29 no.112-113; v.29 no.114; v.29 no.115- v.30 no.116; v.30 no.117-119; v.31 no.120; v.31 no.120 2000; v.31 no.121-122; v.31 no.121 2000; v.31 no.122 2000; v.31 no.123; v.31 no.123 2000; no.121-124 2000-2001; no.12