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This link potentially matches multiple versions of "Young Blue Dragon":

• Young Blue Dragon (System Reference Document 5.2)

  CR 9 · Dragon (Large)

• Young Blue Dragon (Black Flag SRD)

  CR 9 · Dragon (Large)

• Young Blue Dragon (System Reference Document 5.1)

  CR 9 · Dragon (Large)

• Young Blue Dragon (Monstrous Menagerie)

  CR 10 · Dragon (Large)