atmospheric oxygen

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A process-based ecosystem model (Paleo-BGC) to simulate the dynamic response of Late Carboniferous plants to elevated O₂ and aridification
Joseph D. White, Isabel P. Montañez, Jonathan P. Wilson, Christopher J. Poulsen, Jennifer C. McElwain, William A. DiMichele, Michael T. Hren, Sophia Macarewich, Jon D. Richey and William J. Matthaeus

American Journal of Science September 2020, 320 (7) 547-598; DOI: https://doi.org/10.2475/09.2020.01
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Analysis of gases in fossil amber
Gary P. Landis and Robert A. Berner

American Journal of Science May 2018, 318 (5) 590-601; DOI: https://doi.org/10.2475/05.2018.06

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