„Seamless Digital Geological Map of Japan“. The Geological Survey of Japan. National Institute of Advanced Industrial Science and Technology (2-noyabr 2007-yil). 23-yanvar 2013-yilda asl nusxadan arxivlangan. Qaraldi: 16-iyul 2008-yil.
„Seamless Digital Geological Map of Japan“. The Geological Survey of Japan. National Institute of Advanced Industrial Science and Technology (2-noyabr 2007-yil). 23-yanvar 2013-yilda asl nusxadan arxivlangan. Qaraldi: 16-iyul 2008-yil.