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What is mast, a mast year, and why do they occur? (featuring Red and White Oak identification) - YouTube
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Lots of fallen acorns under an english oak tree during a mast year, autumn 2020. Bumper year for acorns Stock Photo - Alamy
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Why are so many acorns on the ground in Chicago? It's a 'mast year,' experts say - Chicago Sun-Times
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