#reader.textbook  one of a series of texts for students learning to read
  supertype:  #textbook__text__text_edition__schoolbook__school_text  a book prepared for use in schools or colleges; "his economics textbook is in its tenth edition"; "the professor wrote the text that he assigned students to buy"
  subtype:  #McGuffey_Eclectic_Readers  readers that combined lessons in reading with moralistic messages

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