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'firsthand knowledge' is correct and can be used in written English
It is used to refer to knowledge gained from direct experience, rather than through a third person (hearsay). For example: "I can offer firsthand knowledge about the city, as I have lived here for over ten years."
Exact(60)
Halperin has firsthand knowledge.
"No firsthand knowledge is necessary".
Mr. Stark has firsthand knowledge of that.
Mr. Johnson, of course, has firsthand knowledge.
Therefore, we have no firsthand knowledge of what happened there.
"I have firsthand knowledge of what it's like.
She said she has firsthand knowledge of heartache.
In finding that balance, Ms. Redgrave was guided by her firsthand knowledge of the English character.
I don't believe much I hear unless I have firsthand knowledge of it.
He also gracefully interjected his own comments, drawing from a wealth of firsthand knowledge.
Presumably, the anti-doping agency would seek firsthand knowledge about doping and corroborating documents from Conte.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com