With 42 Down, geologist's billion years

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The clue we have today is With 42 Down, geologist's billion years from the Newsday.com Crossword. The clue With 42 Down, geologist's billion years can have many different meanings. We did extensive research, and we have found the solution for the Newsday.com Crossword Answer. Scroll down the page and then you will find the correct answer for the clue With 42 Down, geologist's billion years.

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The answer has 3 letters: ONE

Last usage in Newsday.com crosswords puzzle.