found: Work cat.: Bode, Robert W. Biological stream assessment, Mamaroneck River, Westchester County, New York. 1999.
found: GNIS, Aug. 28, 2008(Mamaroneck River, stream, New York State, Westchester County, 40°56ʹ23ʺN 73°43ʹ15ʺW; also with similar name West Branch Mamaroneck River)
found: Office of the Asst. Sec. of the Army (Civil Works). Mamaroneck and Sheldrake Rivers Basin and Byram River Basin, New York and Connecticut. 1983.
found: Schwarz, Philip J. The jarring interests : New York's Boundary Makers, 1664-1776. 1979:p. 11 (... the crookedness of the Mamaroneck River made it unsuitable as a boundary...)
notfound: DeLorme. NY State atlas & gazetteer;NY State Dept. of Transportation. NY State atlas