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Presentation and applications of mixing elements and dissolved isotopes in rivers (MEANDIR), a customizable MATLAB model for Monte Carlo inversion of dissolved river chemistry
Preston Cosslett Kemeny and Mark Albert Torres

American Journal of Science May 2021, 321 (5) 579-642; DOI: https://doi.org/10.2475/05.2021.03
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Paleoaltimetry of the Western Andes in Northern Chile (∼18.5–19.5°S)
Sebastian Jimenez-Rodriguez, Matthew Dettinger, Jay Quade and Kendra E. Murray

American Journal of Science May 2021, 321 (5) 491-533; DOI: https://doi.org/10.2475/05.2021.01
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Terrestrial biomarker isotope records of late Quaternary climate and source-to-sink sediment transport processes in southwestern Taiwan
Queenie Chang, Michael Hren, Andrew T. Lin, Clay Tabor, Shun-Wen Yu, Yvette Eley and Gregory Harris

American Journal of Science April 2021, 321 (4) 393-423; DOI: https://doi.org/10.2475/04.2021.01
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Silurian-Devonian tectonic evolution of mid-coastal Maine, U.S.A.: Details of polyphase orogenic processes
David P. West, Emily M. Peterman and Jessica Chen

American Journal of Science April 2021, 321 (4) 458-489; DOI: https://doi.org/10.2475/04.2021.03
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Thermochemistry of melilites I. Towards resolving an inconsistency in nebular condensation calculations
Richard O. Sack

American Journal of Science April 2021, 321 (4) 424-457; DOI: https://doi.org/10.2475/04.2021.02
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⁴⁰Ar/³⁹Ar and LA-ICP-MS U–Pb geochronology for the New England portion of the Early Cretaceous New England-Quebec igneous province: Implications for the postrift evolution of the eastern North American Margin
Jennifer R. Cooper Boemmels, Jean M. Crespi, Laura E. Webb and Julie C. Fosdick

American Journal of Science March 2021, 321 (3) 365-391; DOI: https://doi.org/10.2475/03.2021.03
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Carbon cycle evolution before and after the Great Oxidation of the atmosphere
Don E. Canfield

American Journal of Science March 2021, 321 (3) 297-331; DOI: https://doi.org/10.2475/03.2021.01
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Unmixing multiple metamorphic muscovite age populations with powder X-ray diffraction and ⁴⁰Ar/³⁹Ar analysis
Ryan J. Mcaleer, David L. Bish, Michael J. Kunk, Peter M. Valley, Gregory J. Walsh and Robert P. Wintsch

American Journal of Science March 2021, 321 (3) 332-364; DOI: https://doi.org/10.2475/03.2021.02
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This Issue Is Dedicated To The Memory Of Distinguished Scientist Alfred Kroner Who Sadly Passed Away On 22 May 2019
Simon A. Wilde, Shoujie Liu, Yamirka Rojas-Agramonte and Guochun Zhao

American Journal of Science January 2021, 321 (1-2) vii-xi; DOI: https://doi.org/10.2475/01.2021.08
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Foreword
American Journal of Science January 2021, 321 (1-2) xii-xiii; DOI: https://doi.org/10.2475/01.2021.09

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