Is it correct?
She came across a rarely-found and yet very valuable book on the subject of political law on a website. It helped her thesis to stand out among hundreds of it.
Please help!!
No. It helped her thesis to stand out among hundreds of others .
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No.
It helped her thesis to stand out among hundreds of others.
By the way, its rarity is no indication of its value as a reference, so "yet" has no support. And compound adjectives with an adverb in "-ly" do not take a hyphen: "rarely found".