| 硫黄島のスケッチ。上の図は西方より、下の図は南東より。パイプ山=摺鉢山。 |
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| Wakimizu, T. (1908) The ephemental volcanic island in the Iwojima group. Publ. Earthq. Invest. Committee, no.22C, 33p. Plate 3. | |||
| Sketches of Io-to Island from the W (upper) and from the SE (lower). |