Issues
#1 [April] 1973
#2 June 1973
#3+1 printing August 1973
#4+1 printing October 1973
#5 December 1973
#6 February 1974
#7+1 printing April 1974
#8+1 printing June 1974
#9+1 printing August 1974
#10+1 printing October 1974
#11 December 1974
#12+1 printing February 1975
#13 April 1975
#14 June 1975
#15+1 printing August 1975
#16+1 printing September 1975
#17+1 printing October 1975
#18+1 printing December 1975
#19 April 1976
#20 June 1976
#21+1 printing August 1976
#22+1 printing October 1976
#23 December 1976
#24 February 1977
#25+1 printing May 1982