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  Down the Black Cañon; or, The Silent Witness. A Drama of the Rocky Mountains. In Four Acts. … Author’s Edition. De Witt’s Acting Plays, no. 357.

  Heermans, Forbes. Down the Black Cañon; or, The Silent Witness. A Drama of the Rocky Mountains. In Four Acts. … Author’s Edition. De Witt’s Acting Plays, no. 357. New York: De Witt Publishing House, c1890. 40, 4 p.