(a) “National Oceanic and Atmospheric Administration.The Climate of 1997. Global Temperature Index: 1997 Warmest Year of Century. Rob Quayle, Tom Peterson, Catherine Godfrey, Alan Basist
National Climatic Data Center, Asheville, NC. January 12, 1998.”
(b) “Anomaly Time Series (Land, SST, and Index)”.
Alternative links with thanks to:- http://archive.is/
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