1 July 1972 - 1 January 1973
| DOI | https://doi.org/10.48597/WNQ7-QYZC |
|---|---|
| Start time | 1 July 1972 |
| Stop time | 1 January 1973 |
| DOI | https://doi.org/10.48597/P33W-9HVX |
|---|---|
| Start time | 1 July 1972 |
| Stop time | 1 January 1973 |
| DOI | https://doi.org/10.48597/EV7E-4HA2 |
|---|---|
| Start time | 1 July 1972 |
| Stop time | 1 January 1973 |