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source material

noun
  1. original, authoritative, or basic materials utilized in research, as diaries or manuscripts.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for source material

Historical Examples

  • We should have the story of the Forty-seven Ronin, not a Japanese stage version, but a work from the source-material.

    The Art Of The Moving Picture

    Vachel Lindsay