玉石 (Japanese Wikipedia)

Analysis of information sources in references of the Wikipedia article "玉石" in Japanese language version.

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doi.org

historytoday.com

j-hss.org

mlit.go.jp

pittsburghcitypaper.ws

  • Potter, Chris (14 October 2004). “Were Pittsburgh's original finished roads and streets paved with cobblestone, Belgian block or some other type of brick?” (英語). en:Pittsburgh City Paper. http://www.pittsburghcitypaper.ws/gyrobase/Content?oid=oid%3A27568 23 September 2009閲覧. "In fact, Belgian block refers not to the type of stone but the way it is cut: in rectangles. People often refer to roads paved this way as "cobblestone streets," but that isn't strictly correct. Cobblestones are rounded, typically because they've been worn smooth by rivers. They might be hell to drive on, but they were cheap: you could just dredge them up from the river...[事実、ベルギー舗装とは石の種類ではなく形状、長方形の切り石を指す。世間ではしばしばこの舗装を「玉石敷きの道」と呼ぶが、厳密には不正確である。玉石には、一般に川で流され摩滅した結果、角がない。車両の走行は乗り心地が悪かろうが、安く仕上がった。川をさらって運んでくれば済むからである。(後略)]" 

salemnews.com

wikipedia.org

en.wikipedia.org

zenchiren.or.jp