The Key (1970 - 1979)
1971
No. 1 (March 22)
No. 2 (March 23)
No. 3 (March 24)
No. 4 (March 25)
1973
No. 1 (March 27)
No. 2 (March 28)
no March 29
No. 3 (March 30)
1975
No. 1 (March 23)
No. 2 (March 24)
no March 25, 26
No. 3 (March 27)
1977
Volume 30 No. 1 (March 18)
Volume 30 No. 2 (March 19)
Volume 30 No. 3 (March 20)
Volume 30 No. 4 (March 21)
Volume 30 No. 5 (March 22)
1979
Volume 31 No. 1 (April 8)
Volume 31 No. 2 (April 9)
Volume 31 No. 3 (April 10)
Volume 31 No. 4 (April 11)
Volume 31 No. 5 (April 12)