Context

Context of 20-manbun no 1 sūchi chishitsuzu fuku shū "Kantō Kōshinʼetsu oyobi Izu Ogasawara Shotō", Sangyō Gijutsu Sōgō Kenkyūjo, Chishitsu Chōsa Sōgō Sentā = Digital geological maps of Japan 1:200,000, Kantō-Kōshinetsu and Izu-Ogasawara Islands / Geological Survey of Japan, AIST, (electronic resource)
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