This journal article, "Effect of stream channel size on the delivery of nitrogen to the gulf of Mexico," recently published in Nature, provides data and discussion on the means of distribution and significant sources of an increased flux of nitrogen from the Mississippi River into the Gulf of Mexico during the latter half of the 20th century. The paper analyzes data taken from 374 US monitoring stations, including 123 along the six largest tributaries to the Mississippi. The article concludes "that the proximity of sources to large streams and rivers is an important determinant of nitrogen delivery to the estuary in the Mississippi basin, and possibly also in other large river basins."