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Books about Yinji:
Zhuzhu baibai: Beitang jiu cang Qi Baishi yinji by Unknown (2010)
[Qi Baishi Seals in the Beitang Collection] - Zhuzhu baibai: Beitang jiu cang Qi Baishi yinji by Shanghai Shuhua Chubanshe (2010)
Wiki information Yinji:
The battle of Yinji was a battle fought at the Yin Village of Wuyang County in southern Henan, and it was a clash between the communists and the former nationalists turned Japanese puppet regime force who rejoined the nationalists after World War II....
Yinji was the son of Kangxi Emperor.