IZUMI Keiko, SATO Kosuke. How a Rock-climbing Area Is Managed, and Its Benefit to the Local Economy: A Case Study on Kasagi Mountain in Gifu Prefecture. Journal of Forest Economics. 2021. 67. 2. 1-15
Keiko Izumi, Risa Sasaki. How the Matsutake Mushroom Become a Luxury Food during the Postwar Period: Changes in Its Usage and Value Revealed in Monthly Cooking Magazines, Comics, and Gatherer's Perceptions. Journal of the Japanse Forest Society. 2021. 103. 1. 1-12
Keiko Izumi. Spatial Distribution of Local Forest Products at the End of the 19th Century: A Case Study of Former Villages in Iwate Prefecture. Forests. 2020. 11. 10. 1044-1058
Kaori Sugawara, Keiko Izumi. Chronological Change of the How Hometown Tax System Impressed itself in Local Newspapers: a Decennial Empirical Case Study on "Iwate Nippo" and "Kahoku Shinpo" from 2007 to 2017. Journal of policy studies. 2019. 20. 29-45
Keiko Izumi. "The Dynamics of People and Ecosystem 2 : History and Future of Forest in Japan" written by SUZUKI Maki, SAITO Haruo, NISHIHIRO Jun, and MIYASHITA Tadashi. Forest Economy. 2020. 73. 6. 21-26
Why did They Choose to be Forest Workers among Diverse Jobs?: An Interview on Male Graduates of Iwate Forestry Academy
(the 134th Annual JFS Meeting (2021 meeting))