TY - JOUR T1 - Stable carbon and nitrogen isotopic compositions of organic compound classes in high molecular weight dissolved organic matter from four U. S. estuaries JF - Geochimica et Cosmochimica Acta Y1 - 2004 A1 - Wang, X. C. A1 - Altabet, A. M. A1 - Callahan, J. A1 - Chen, R. F. VL - 68 N1 - id: 515 ER -