An article on September issue of 1926 by G. J. Ramstedt: Chōsen oyobi Nihon no ni-tango ni tsute (pages 17-24).
Two copies of September issue of 1926.
Japonica collection: 1925 November; 1926 May, September, November; 1927 January, March, May, July, September, November; 1928 January, May, September; 1929 January, April (大正十四年十一月・大正十五年五月、九月、十一月・大正十六年一月・昭和二年三月、五月、七月、九月、十一月・昭和三年一月、五月、九月・昭和四年一月、四月發行).