- Yokoyama, M., 1927d:
- Tertiary fossils from western Hizen.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 4, pp. 183–190, pl. 50.
- Yokoyama, M., 1927e:
- Tertiary shells from the coal-field of Haboro, Teshio.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 4, pp. 191–204, pls. 51–52.
- Yokoyama, M., 1927f:
- On the occurrence of the lower Tertiary formation in the Province of Hoki.
- Journal of the Geological Society of Tokyo, vol. 34, no. 406, pp. 13–14, pl. 8.
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- Kobayashi, T., 1928:
- Ordovician fossils from Corea and south Manchuria.
- Japanese Journal of Geology and Geography, vol. 5, no. 4, pp. 173–212, pls. 18–22.
PDF in prep.
- Yokoyama, M., 1928a:
- Pliocene shells from Hyuga.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 7, pp. 331–350, pls. 66–67.
- Yokoyama, M., 1928b:
- Neogene shells from the oil-field of Higashiyama, Echigo.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 7, pp. 351–362, pls. 68–69.
- Yokoyama, M., 1928c:
- Semi-fossil shells from Noto.
- Imperial Geological Survey of Japan, Report, no. 101, pp. 113–128, pls. 19–21.
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- Kawada, M., 1929:
- On some new species of ammonites from the Naibuchi district, south Sakhalin.
- Journal of the Geological Society of Tokyo, vol. 36, no. 428, pp. 1–6, pl. 14.
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- Otuka, Y., 1929:
- A stratigraphical study of the Oiso block and its adjacent area. Part 1.
- Journal of the Geological Society of Tokyo, vol. 36, no. 433, pp. 435–456, pl. 17. (in Japanese)
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- Saheki, S., 1929:
- On some new Tertiary fossil fishes from Tanegashima, Kagoshima Prefecture, Kyushu, Japan.
- Journal of the Geological Society of Tokyo, vol. 36, no. 435, pp. 21–24, pl. 18.
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- Yokoyama, M., 1929a:
- Neogene shells from some provinces of Chugoku.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 8, pp. 363–368, pl. 70.
- Yokoyama, M., 1929b:
- Molluscan fossils from Karafto.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 9, pp. 369–398, pls. 71–76.
- Yokoyama, M., 1929c:
- Pliocene shells from near Nanao, Noto.
- Imperial Geological Survey of Japan, Report, no. 104, pp. 1–7, pls. 1–6.
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- Kobayashi, T., 1930:
- Ordovician fossils from Korea and south Manchuria. Part 2. On the Bantatsu bed of the Ordovician age.
- Japanese Journal of Geology and Geography, vol. 7, nos. 3–4, pp. 75–100, pls. 8–11.
PDF in prep.
- 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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- Tokunaga, S. and Iizuka, M., 1930:
- Geological studies on the Ube coal-field.
- Memoirs of the Faculty of Science and Engineering, Waseda University, no. 6, pp. 1–151, pls. 1–7. (in Japanese)
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- Yokoyama, M., 1930a:
- Neogene shells from Yamashiro.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 10, pp. 399–403.
- Yokoyama, M., 1930b:
- On a univalve called Cochlioconus gradatus Yokoyama.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 10, pp. 405–406.
- Yokoyama, M., 1930c:
- Tertiary Mollusca from south Karafto.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 2, pt. 10, pp. 407–418, pls. 77–80.
- Kobayashi, T., 1931a:
- Studies on the stratigraphy and palaeontology of the Cambro-Ordovician formation of Hua-lien-chai and Niu-hsin-tai, south Manchuria.
- Japanese Journal of Geology and Geography, vol. 8, no. 3, pp. 131–189, pls. 16–22.
PDF in prep.