1 January 1973 - 1 April 1975
| DOI | https://doi.org/10.48597/CDP4-VECK |
|---|---|
| Start time | 1 January 1973 |
| Stop time | 1 April 1975 |
| DOI | https://doi.org/10.48597/XGWK-TJKP |
|---|---|
| Start time | 1 January 1973 |
| Stop time | 1 April 1975 |
| DOI | https://doi.org/10.48597/ZS7F-GCCD |
|---|---|
| Start time | 1 January 1973 |
| Stop time | 1 April 1975 |