up:
  - "[[N 自然科学总论]]"
ctime: 2025-01-25T15:17:16+08:00
english: Studies of nature, history of nature
aliases:
  - N91 - Studies of nature, history of nature
  - Studies of nature, history of nature
  - 自然研究、自然历史
mtime: 2025-09-09T12:37:17+08:00