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"carbon, n."OED Online. Oxford University Press. Archived from the original on 24 March 2023. Retrieved 24 March 2023.
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"carbon, n."OED Online. Oxford University Press. Archived from the original on 24 March 2023. Retrieved 24 March 2023.
Safire, William (17 February 2008). "On language: footprint". The New York Times. Archived from the original on 14 March 2020. Retrieved 8 October 2024.