| Title | Paper | Date | Type | ||
|---|---|---|---|---|---|
| 1 |
 |
Vernal Express | 1969-09-25 | unclassified | |
| 2 |
 |
Vernal Express | 1973-09-06 | unclassified | |
| 3 |
 |
Vernal Express | 1973-09-13 | unclassified | |
| 4 |
 |
Vernal Express | 1977-09-01 | unclassified | |
| 5 |
 |
Vernal Express | 1977-09-08 | unclassified | |
| 6 |
 |
Vernal Express | 1977-09-15 | unclassified | |
| 7 |
 |
Vernal Express | 1977-09-22 | unclassified | |
| 8 |
 |
Vernal Express | 1977-09-22 | unclassified | |
| 9 |
 |
Vernal Express | 1977-09-29 | unclassified | |
| 10 |
 |
Vernal Express | 1978-09-14 | unclassified | |
| 11 |
 |
Vernal Express | 1978-09-28 | unclassified | |
| 12 |
 |
Vernal Express | 1979-09-06 | unclassified | |
| 13 |
 |
Vernal Express | 1979-09-13 | unclassified | |
| 14 |
 |
Vernal Express | 1979-09-20 | unclassified | |
| 15 |
 |
Vernal Express | 1979-09-27 | unclassified | |
| 16 |
 |
Vernal Express | 1980-09-11 | unclassified | |
| 17 |
 |
Vernal Express | 1980-09-18 | unclassified | |
| 18 |
 |
Vernal Express | 1980-09-25 | unclassified | |
| 19 |
 |
Vernal Express | 1981-09-24 | unclassified |