Clue: Scientific breakthrough of the '30s
Scientific breakthrough of the '30s is a crossword puzzle clue that we have spotted 4 times. There are related clues (shown below).
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Recent usage in crossword puzzles:
- Pat Sajak Code Letter - Aug. 6, 2009
- Universal Crossword - Oct. 17, 2006
- Universal Crossword - Sept. 17, 2006
- USA Today - May 25, 2006
