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@book{139348,
  author       = {Spindler \& Hoyer},
  title        = {{Apparate für psychologische Untersuchungen, 
                   Katalog XXI}},
  publisher    = {Göttingen},
  year         = 1921,
  language     = {de},
  url          = {https://vlp-new.ur.de/records/lit23709}
}