@book{1904batchelorjohn18541944thekoropokguruorpitdwellersofnorthjapanan,
  title = {The Koropok-Guru or pit-dwellers of north Japan, and, A critical examination of the nomenclature of Yezo},
  author = {John Batchelor},
  year = {1904},
  language = {ain},
  url = {https://archive.org/details/bub\_gb\_TEFBbXypvhgC}
}