@misc{sentokupilsudskiletters,
  title = {千徳太郎治のピウスツキ宛書簡 (Sentoku Tarōji's Letters to Piłsudski)},
  author = {千徳 太郎治},
  year = {1906},
  language = {ain},
  note = {樺太},
  howpublished = {https://opac.ll.chiba-u.jp/da/curator/900023326/}
}