@article {PIE99, title = {Pre-industrial and contemporary fluxes of nitrogen through rivers: A global assessment based on typology}, journal = {Biogeochemistry}, volume = {68}, year = {2003}, note = {PI Synthesis}, pages = {1-35}, keywords = {anthropogenic loading, global, inorganic nutrients, LTER-PIE, nitrogen, nitrogen budget, nitrogen yields, rivers, watershed}, doi = {10.1023/B:BIOG.0000025742.82155.92}, author = {Green, P.A. and Vorosmarty, C.J. and Meybeck, M. and Galloway, J.N. and Peterson, B.J. and Boyer, E.W.} }