- Yokoyama, M., 1920:
- Fossils from the Miura peninsula and its immediate north.
- Journal of the College of Science, Imperial University of Tokyo, vol. 39, art. 6, pp. 1–193, pls. 1–20.
- Yabe, H. and Shimizu, S., 1921:
- Notes on some Cretaceous ammonites from Japan and California.
- Science Reports of the Tohoku Imperial University, 2nd Series, vol. 5, no. 3, pp. 53–59, pls. 8–9.
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- Ozawa, Y., 1922:
- Preliminary note on the classification of the family Fusulinidae.
- Journal of the Geological Society of Tokyo, vol. 29, no. 348, pp. 357–374, pl. 4. (in Japanese)
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- Yokoyama, M., 1922a:
- Fossils from the upper Musashino of Kazusa and Shimosa.
- Journal of the College of Science, Imperial University of Tokyo, vol. 44, art. 1, pp. 1–200 + i–viii, pls. 1–17.
- Yokoyama, M., 1922b:
- On a new species of Pecten from the Neogene of Japan.
- Journal of the Geological Society of Tokyo, vol. 29, no. 350, pp. 1–2, pl. 5.
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- Ozawa, Y., 1923:
- On some species of Fusulina from Honan, China.
- Japanese Journal of Geology and Geography, vol. 2, no. 2, pp. 35–39, pl. 5.
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- Yokoyama, M., 1923a:
- On some fossil shells from the island of Saishu in the strait of Tsushima.
- Journal of the College of Science, Imperial University of Tokyo, vol. 44, art. 7, pp. 1–9, pl. 1.
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- Yokoyama, M., 1923b:
- Tertiary Mollusca from Dainichi in Totomi.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 2, pp. 1–18, pls. 1–2.
- Yokoyama, M., 1923c:
- On some fossil Mollusca from the Neogene of Izumo.
- Japanese Journal of Geology and Geography, vol. 2, no. 1, pp. 1–9, pls. 1–2.
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- Yokoyama, M., 1923d:
- Tertiary fossils from Kii.
- Japanese Journal of Geology and Geography, vol. 2, no. 3, pp. 47–58, pls. 6–7.
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- Yokoyama, M., 1924a:
- Mollusca from the coral-bed of Awa.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 1, pp. 1–62 + i–iii, pls. 1–5.
- Yokoyama, M., 1924b:
- Molluscan remains from the lowest part of the Jo-ban coal-field.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 3, pp. 1–22, pls. 1–5.
- Ozawa, Y., 1925a:
- On the classification of Fusulinidae.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 4, pp. 1–26, pls. 1–4.
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- Ozawa, Y., 1925b:
- Paleontological and stratigraphical studies on the Permo-Carboniferous limestone of Nagato. Part 2. Paleontology.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 6, pp. 1–90, pls. 1–14.
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- Ozawa, Y., 1925c:
- A brief critical revision of the Fusulina-species recently described, with additional studies on Japanese Fusulinae.
- Journal of the Geological Society of Tokyo, vol. 32, no. 387, pp. 19–27, pls. 9–10.
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- Saeki, S., 1925:
- On some new species of Jurassic Trigonia from Province of Tamba, Japan.
- Journal of the Geological Society of Tokyo, vol. 32, no. 387, pp. 35–36, pl. 12.
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- Yokoyama, M., 1925a:
- Molluscan remains from the uppermost part of the Jo-ban coal-field.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 5, pp. 1–34, pls. 1–6.
- Yokoyama, M., 1925b:
- Molluscan remains from the middle part of the Jo-ban coal-field.
- Journal of the College of Science, Imperial University of Tokyo, vol. 45, art. 7, pp. 1–23, pls. 1–3.
- Yokoyama, M., 1925c:
- Tertiary Mollusca from Shinano and Echigo.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 1, pp. 1–23, pls. 1–7.
- Yokoyama, M., 1925d:
- Mollusca from the Tertiary basin of Chichibu.
- Journal of the Faculty of Science, Imperial University of Tokyo, Section 2, vol. 1, pt. 3, pp. 111–126, pls. 14–15.