• April 1970

  Vol 7 No 2 (1970)
• July 1970

  Vol 7 No 3 (1970)
• October 1970

  Vol 7 No 4 (1970)
• January 1971

  Vol 8 No 1 (1971)
• April 1971

  Vol 8 No 2 (1971)
• July 1971

  Vol 8 No 3 (1971)
• October 1971

  Vol 8 No 4 (1971)
• January 1972

  Vol 9 No 1 (1972)
• April 1972

  Vol 9 No 2 (1972)
• July 1972

  Vol 9 No 3 (1972)
• October 1972

  Vol 9 No 4 (1972)
• January 1973

  Vol 10 No 1 (1973)
• April 1973

  Vol 10 No 2 (1973)
• July 1973

  Vol 10 No 3 (1973)
• October 1973

  Vol 10 No 4 (1973)
• January 1974

  Vol 11 No 1 (1974)
• April 1974

  Vol 11 No 2 (1974)
• July 1974

  Vol 11 No 3 (1974)
• October 1974

  Vol 11 No 4 (1974)
• January 1975

  Vol 12 No 1 (1975)
• April 1975

  Vol 12 No 2 (1975)
• July 1975

  Vol 12 No 3 (1975)
• October 1975

  Vol 12 No 4 (1975)
• January 1976

  Vol 13 No 1 (1976)
• April 1976

  Vol 13 No 2 (1976)