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They cite what looks like this book in the footer https://www.amazon.com/Traditional-Colors-Japan-Japanese/dp/475624100X https://www.amazon.com/Traditional-Col

by neilpa 6y ago

They cite what looks like this book in the footer https://www.amazon.com/Traditional-Colors-Japan-Japanese/dp/475624100X https://www.amazon.com/Traditional-Colors-Japan-Japanese/dp/... Although it references a 2007 edition.