no. 3 - March 1971

no. 4 - April 1971

no. 5 - May 1971

no. 6 - June 1971

no. 7 - July 1971

no. 8 - August 1971

no. 10 - January 1972

no. 11 - March 1972

no. 15 - May/June 1973

no. 16 - August 1973

no. 17 - November 1973