Reports, Geological Survey of Japan(1951)

Table of contents

Number	Title	Author
No.137	Some Problems of Seismic Exploration	Hayakawa Masami
No.138	Report on the Geology of Hitachi-Nakamura District in Oani Coal Field, Kita-akitagun, Akita Prefecture	Takehara Heiichi and Matsui Hiroshi
No.139	An Orbicular Rock in Andesite from Akagi Volcano, Japan	Koide Haku
No.140	Report on the Geology of North-Futaba District in Joban Coal Field, Fukushima Prefecture	Mita Masakazu
No.141	On the So-called Spessartite and Associated Granophyres of Shiratori-honmachi, Kagawa Prefecture, Shikoku	Kirayama Ken
No.142	Investigation of the Time Variation of Seismic Wave-Velocity	Hayakawa Masami
No.143	On the Character of Fissures and Precipitation of Ore Minerals at Several Zinc and Lead Deposits in Japan	Ito Shosuke
No.144	Annual Report of Progress (1947 - 1949)