北硫黄島のスケッチ。左上は北西より、下は南東より。 |
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| Wakimizu, T. (1908) The ephemental volcanic island in the Iwojima group. Publ. Earthq. Invest. Committee, no.22C, 33p. Plate 2. | |||
| Sketches of Kita Io-to Island from the NW (upper left) and from the SE (lower). |