Holdings:
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no.3/77 (1977); no.1/78 (1978); no.1/79 (1979); no.1/80 (1980); no.1/81 (1981); no.1/84 (1984); no.1/85 (1985); no.8/85 (1985); no.10/85 (1985); no.13/85 (1985); no.18/85 (1985); no.1/86 (1986); no.4/86 (1986); no.7/86 (1986); no.12/86 (1986); no.17/86 (1986); no.1/87 (1987); no.17/87 (1987); no.36/87 (1987); no.3/88 (1988); no.7/88 (1988); no.12/88 (1988); no.27/88 (1988); no.30/88 (1988); no.34/88 (1988); no.2/89 (1989); no.6/89 (1989); no.10/89 (1989); no.15/89 (1989); no.26/89 (1989); no.3/90 (1990); no.7/90 (1990); no.16/90 (1990); no.24/90 (1990); no.28/90 (1990); no.1/91 (1991); no.3/91 (1991); no.6/91 (1991); no.25/91 (1991); no.33/91 (1991) - no.2/92 (1992); no.4/92 (1992); no.7/92 (1992); no.11/92 (1992); no.14/92 (1992); no.30/92 (1992); no.33/92 (1992); no.39/92 (1992); no.60/92 (1992); no.1/93 (1993); no.20/93 (1993); no.27/93 (1993); no.40/93 (1993) - no.3/94 (1994); no.5/94 (1994); no.2/95 (1995); no.1/96 (1996);
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