up:
  - "[[N 自然科学总论]]"
ctime: 2025-06-04T19:30:54+08:00
english: Non-book materials, audio-visual materials of natural science
aliases:
  - N79 - Non-book materials, audio-visual materials of natural science
  - Non-book materials, audio-visual materials of natural science
  - 非书资料、视听资料
mtime: 2025-09-09T12:37:17+08:00