Masafumi AOYAMA. Investigation of the disaster caused by the Typhoon No. 19 (Typhoon Hagibis) in the lower reaches of Tokigawa River, Saitama Prefecture. Annal Reports of the Cooperative Faculty of Education, Gunma University, Cultural Science Series. 2023. 72. 69-78
Masafumi AOYAMA. Investigation of the stone monuments related to the hail and frost damages in the southern part of Gunma prefecture. 2022. 71. 65-73