Issues
#1 #1 November 1971
#2 #2 February 1972
#3 #3 May 1972
#4 #4 June 1972
#5 #5 August 1972
#6 #6 October 1972
#7 #7 December 1972
#8 #8+1 printing February 1973
#9 #9+1 printing April 1973
#10 #10+1 printing June 1973
#11 #11+1 printing August 1973
#12 #12+2 printings October 1973
#13 #13+1 printing January 1974
#14 #14 March 1974
#15 #15 May 1974
#16 #16 July 1974
#17 #17+1 printing September 1974
#18 #18 October 1974
#19 #19 December 1974
#20 #20 February 1975
#21 #21 April 1975
#22 #22 June 1975
#23 #23 August 1975
#24 #24 October 1975
#25 #25 December 1975
#26 #26+1 printing February 1976
#27 #27+2 printings April 1976
#28 #28+2 printings June 1976
#29 #29+2 printings August 1976
#30 #30+1 printing October 1976
#31 #31+1 printing December 1976
#32 #32 February 1977
#33 #33 April 1977