| Chronological order of issues |
| 1977 |
| Volume 13 Number 3 |
| Volume 13 Number 2 |
| 1976 |
| Volume 12 Number 3 |
| Volume 12 Number 2 |
| Volume 12 Number 1 |
| 1975 |
| Volume 11 Number 3 |
| Volume 11 Number 2 |
| Volume 11 Number 1 |
| 1974 |
| Volume 10 Number 3 |
| 1973 |
| Volume 9 Number 1 |
| Volume 9 Number 3 |
| 1972 |
| Volume 8 Number 3 |
| Volume 8 Number 2 |
| Volume 8 Number 1 |
| 1971 |
| Volume 7 Number 3 |
| Volume 7 Number 2 |
| Volume 7 Number 1 |
| 1970 |
| Volume 6 Number 3 |
| Volume 6 Number 2 |
| Volume 6 Number 1 |