Ōya stone (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ōya stone" in English language version.

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asahi.com

Miyasaka, Asako (18 June 2010). "Underground mine preserves legacy of Oya stone". The Asahi Shimbun. Archived from the original on 2 October 2010. Retrieved 28 May 2011.

NIPPONIA (15 December 2002). "An old oya-ishi stone mine". NIPPONIA. Archived from the original on 6 June 2011. Retrieved 4 April 2009.

NIPPONIA (15 December 2002). "An old oya-ishi stone mine". NIPPONIA. Archived from the original on 6 June 2011. Retrieved 4 April 2009.
Miyasaka, Asako (18 June 2010). "Underground mine preserves legacy of Oya stone". The Asahi Shimbun. Archived from the original on 2 October 2010. Retrieved 28 May 2011.