Key term for OCR GCSE History A, used in China 1950–1981.
A destructive hygiene and agricultural campaign that targeted sparrows, rats, flies, and mosquitoes, causing severe ecological imbalance.
Four Noes appears in OCR GCSE History A revision content for Non-British Depth Studies, especially China 1950–1981 and Establishing Communism in China 1950–1965.
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