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Organic carbon-14 in the Amazon river system.
Hedges JI, Ertel JR, Quay PD, Grootes PM, Richey JE, Devol AH, Farwell GW, Schmidt FW, Salati E. Hedges JI, et al. Among authors: ertel jr. Science. 1986 Mar 7;231(4742):1129-31. doi: 10.1126/science.231.4742.1129. Science. 1986. PMID: 17818540
Lignin signature of aquatic humic substances.
Ertel JR, Hedges JI, Perdue EM. Ertel JR, et al. Science. 1984 Feb 3;223(4635):485-7. doi: 10.1126/science.223.4635.485. Science. 1984. PMID: 17781443