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• 16:07, 1 August 2023 Sky talk contribs created page New organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils (Q152902) (wbeditentity-create-item:0|: Added new publication item from USGS Pubs Warehouse)