Poem.

no.1-10 1967-1970; no.3-8 (1968-70); no.9-13; no.11-19 1971-1973; no.14-18; no.20-25 1974-1975; no.26-34 1976-1978; no.35-43 1979-1981; no.44-49 1982-1983; no.50-56 1984-1986; no.57-62 1987-1989; no.61-64 1989-1990; no.63-68 1990-1992; no.65-70 1991-1993; no.69-72 1993-1994; no.73-76 1995-1996; no.75-76 1996; no.77-78 1997; no.77-80 1997-1998; no.79-80 1998; no.81-83 1999-2000; no.81-86 1999-2001; no.87-90 2002-2003; no.87-92 2002-2004