- Otuka, Y., 1930:
- A new variety of fossil Umbonium.
- Journal of the Geological Society of Tokyo, vol. 37, no. 436, pp. 25–26.
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- Otuka, Y., 1932:
- On the shells of fossiliferous strata, 15m. below the earth's surface, in Gobancho, Kojimachi-ku, Tokyo.
- Venus, vol. 3, no. 2, pp. 109–112. (in Japanese)
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- Otuka, Y., 1933a:
- A new species of fossils Ringicula from the Japanese Miocene.
- Venus, vol. 4, no. 1, pp. 15–16.
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- Otuka, Y., 1934a:
- Tertiary structures of the northwestern end of the Kitakami mountainland, Iwate Prefecture, Japan.
- Bulletin of the Earthquake Research Institute, Tokyo Imperial University, vol. 12, pt. 3, pp. 566–638, pls. 44–51.
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- Otuka, Y., 1935a:
- Stratigraphy of the northern part of the Oti graben, Ishikawa Prefecture.
- Journal of the Geological Society of Japan, vol. 42, no. 503, pp. 483–510, pl. 14. (in Japanese)
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- Otuka, Y., 1935b:
- The Oti graben in southern Noto peninsula, Japan. (Part 3).
- Bulletin of the Earthquake Research Institute, Tokyo Imperial University, vol. 13, pt. 4, pp. 846–909, pls. 53–57.
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- Otuka, Y., 1935c:
- Serripes in Japan.
- Journal of the Geological Society of Japan, vol. 42, no. 504, pp. 601–604, pls. 15–16.
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- Otuka, Y., 1936a:
- Pliocene Mollusca from Manganzi in Kotomo-mura, Akita Pref., Japan.
- Journal of the Geological Society of Japan, vol. 43, no. 516, pp. 726–736, pls. 41–42.
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- Otuka, Y., 1936b:
- Note on the some shells from southern Taiwan (1).
- Venus, vol. 6, no. 3, pp. 155–162. (in Japanese)
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- Otuka, Y., 1936c:
- The Takasegawa green tuff beds of the Yuri district, Akita Pref., Japan, and correlation of the lower Neogene in Japan.
- Bulletin of the Earthquake Research Institute, Tokyo Imperial University, vol. 14, pt. 3, pp. 438–452, pl. 30.
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- Otuka, Y., 1936d:
- Note on the some shells from southern Taiwan (2).
- Venus, vol. 6, no. 4, pp. 232–239. (in Japanese)
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- Otuka, Y., 1937a:
- The geologic age of the Tertiary formation near Hamada, Simane Prefecture, Japan.
- Japanese Journal of Geology and Geography, vol. 14, nos. 1–2, pp. 23–32, pl. 3.
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- Otuka, Y., 1937b:
- Note on the some shells from southern Taiwan (3).
- Venus, vol. 7, no. 3, pp. 128–143. (in Japanese)
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- Otuka, Y., 1937c:
- Middle Tertiary Mollusca from north Hokkaido and Zyoban coal-field, Japan.
- Japanese Journal of Geology and Geography, vol. 14, nos. 2–3, pp. 167–171, pl. 16.
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- Otuka, Y., 1937d:
- Diodora in Japan.
- Journal of the Geological Society of Japan, vol. 44, no. 529, pp. 939–946, pl. 30.
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- Otuka, Y., 1938a:
- Catalogue of the Japanese species of the genus Turritella.
- Venus, vol. 8, no. 1, pp. 37–44. (in Japanese)
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- Otuka, Y., 1938b:
- Neogene fossils of the Ihara district, Sizuoka Prefecture, Japan.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 5, pt. 1, pp. 1–19, pls. 1–2.
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- Otuka, Y., 1938c:
- Mollusca from the Miocene of Tyugoku, Japan.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 5, pt. 2, pp. 21–45, pls. 1–4.
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- Otuka, Y., 1939a:
- Mollusca from the Cainozoic system of eastern Aomori Prefecture, Japan.
- Journal of the Geological Society of Japan, vol. 46, no. 544, pp. 23–31, pl. 2.
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