Mayewski, P. A. and M. R. Legrand. 1990. Recent increase in nitrate concentration of Antarctic snow. Nature 346:258-260.

Mayewski, P. and S. Whitlow. 2000. South Pole snow pit, 1988 and 1989. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media. Accessed 19 January 2009.

Access Data: available via FTP

Time Period: 1988-1989 austral summer

Sample Points: 1

Sample Location: 90° S