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https://scholar.google.com/scholar_lookup?title=The%20mineral%20depletion%20of%20foods%20available%20to%20us%20as%20a%20nation%20(1940%E2%80%932002)%E2%80%94A%20review%20of%20the%206th%20Edition%20of%20McCance%20and%20Widdowson&author=Thomas,+D.&publication_year=2007&journal=Nutr.+Health&volume=19&pages=21%E2%80%9355&doi=10.1177/026010600701900205