This page records gaps in the public Year → Issue archive without converting leads into evidence. An item remains unresolved until an original issue, message header, attachment, masthead, distribution notice or reliable institutional capture is recovered and verified.
Highest-priority targets
- 大参考 / Dacankao FAQ v2.0 dated March 14, 1998.
- The original bignews.org archive index, masthead and issue files.
- 大参考 / Dacankao No. 1 and the earliest distribution notices.
- 小参考 / Xiao Cankao Nos. 1–43.
- Original files and verified dates for registered issues Nos. 233, 269, 339, 418, 437, 463, 467, 474 and 705.
Preservation rule
Original files and headers are preserved where authorized; normalized searchable text is derivative access material and must retain provenance back to the preserved carrier.