...“I am glad to have heard your narrative, Major,” replied Swinton; “for many doubts have been thrown upon the question of the power of the human eye, and your opinion is a very corroborative one... 
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...A faint squeak undergroundgave additional and corroborative evidence...
Ernest Thompson Seton 「Wild Animals at Home」
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