Local population studies.

v.8-15 1972-1975; v.16-23 1976-1979; no.1-7; no.24-29 1980-1982; v.30-33 1983-1984; no.34-37 (1985-86); v.42-47 1989-1991; v.48-51 1992-1993; v.52-55 1994-1995; no.38-41; no.45; no.56-58; no.58-65; no.58-61 1997-1998; no.62-63 1999; no.64-67 2000-2001; no.66-69 2001-02; no.68-69 2002; no.70-73(2003-04); no.70-73 2003-2004; no.74-75(2005); no.74-75 2005; no.76-77(2006); no.76-77 2006; no.78-79 2007; no.80-81 2008; index nos.1-20