What medium is "Picture Book: Thousand-Year Mountain? (Ehon Chitoseyama? 絵本千年山?"?

Picture Book: Thousand-Year Mountain? (Ehon Chitoseyama? 絵本千年山? is Woodblock print; ink on paper.

Is "Picture Book: Thousand-Year Mountain? (Ehon Chitoseyama? 絵本千年山?" in the public domain?

Yes, Picture Book: Thousand-Year Mountain? (Ehon Chitoseyama? 絵本千年山? is in the public domain and available for free download under CC0 license.

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Nishikawa Sukenobu, 1740