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    "sources/emmanuel2025-kano-urban-vegetables-metals",
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    "sources/owusuadoma2024-ghana-lettuce-metals",
    "sources/rempelos2023-vegetable-organic-conventional-metals",
    "sources/romero-crespo2023-trace-elements-crops-ecuador-mining",
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    "sources/zhang2024-lettuce-cadmium-greenhouse-amendments"
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