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- When the British Empire collapses, historians will find that it had made but two invaluable contributions to civilization—this tea ritual and the detective novel.2.4 — Part 2 Chapter 4 (30% in)
- He was invaluable to Wynand—as a barometer of public reaction.3.1 — Part 3 Chapter 1 (79% in)
There are no more uses of "invaluable" in The Fountainhead.
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