But supposing all these conjectures to be false, you cannot contest the inestimable benefit which I shall confer on all mankind, to the last generation, by discovering a passage near the pole to those countries, to reach which at present so many months are requisite; or by ascertaining the secret of the magnet, which, if at all possible, can only be effected by an undertaking such as mine.
There are no more uses of "inestimable" in the book.
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jewels of inestimable value
a right inestimable to them
Thomas Jefferson et al. -- The Declaration of Independence