| Periodical Volume Date: 1968 | (1/1023) |
| Periodical Volume Date: 1969 | (1/638) |
| Periodical Volume Date: 1971 | (1/1141) |
| Periodical Volume Date: 1972 | (1/1448) |
| Periodical Volume Date: 1973 | (1/1309) |
| Periodical Volume Date: 1974 | (1/1838) |
| Periodical Volume Date: 1975 | (1/1650) |
| Periodical Volume Date: 1976 | (1/1977) |
| Periodical Volume Date: 1977 | (1/1366) |
| Periodical Volume Date: 1978 | (1/1756) |
| Periodical Volume Date: 1979 | (1/1813) |
| Periodical Volume Date: 1987 | (1/1804) |
