Image: YiXiangKaoCheng 02
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Description: Method of making observation instruments
Title: YiXiangKaoCheng 02
Credit: YiXiangKaoCheng（《儀象考成》）
Author: Mainly based on 徐光啟's 《崇禎曆書》 (late Ming Dynasty)
Permission: Public Domain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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