| Digest Vol. 6, No. 01 | Jan | 1999 |
| Digest Vol. 6, No. 02 | Feb | 1999 |
| Digest Vol. 6, No. 03 | Mar | 1999 |
| Digest Vol. 6, No. 04 | Apr | 1999 |
| Digest Vol. 6, No. 05 | Jun | 1999 |
| Digest Vol. 6, No. 06 | Jul | 1999 |
| Digest Vol. 6, No. 07 | Aug | 1999 |
| Digest Vol. 6, No. 08 | Sep | 1999 |
| Digest Vol. 6, No. 09 | Oct | 1999 |
| Digest Vol. 6, No. 10 | Nov | 1999 |
| Digest Vol. 6, No. 11 | Dec | 1999 |