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https://earthwormexpress.com/the-fascinating-history-and-use-of-ascorbate/regulations-of-nitrate-and-nitrite-post-1920s-the-problem-of-residual-nitrite-and-the-introduction-of-ascorbate/
Regulations of Nitrate and Nitrite post-1920's: the problem of residual nitrite and the introduction of ascorbate