Efremova, Elena Nikolaevna. “An Interrupted Flight: Unpublished Soviet Regional Encyclopedias of the 1920s-1930s”. Quaestio Rossica, no. 2 (May 6, 2024): 151–166. Accessed July 22, 2024. https://qr.urfu.ru/ojs/index.php/qr/article/view/047.