Clue: Proven over a long period
Proven over a long period is a crossword puzzle clue that we have spotted 5 times. There are related clues (shown below).
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Recent usage in crossword puzzles:
- Universal Crossword - Aug. 30, 2020
- Pat Sajak Code Letter - July 21, 2014
- USA Today - Dec. 3, 2012
- New York Times - Feb. 19, 1991
- New York Times - Dec. 8, 1976
