The Duke University library offers many East-Asia resources for K-12 teachers and students. The library portal has links to hundreds of specialized websites covering East Asia, with a special emphasis on China, Japan, and Korea.
The site is very well organized and has a lot of fun information
Home start page. https://guides.library.duke.edu/K-12resourcesonEA
This is a great starting point to explore topics from anime to martial arts, visual arts, etc.
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