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Links and References
Alaska Science Forum: The Earth's Changing Orbit
J.D Hays, John Imbrie, and N.J. Shackleton, "Variations in the Earth's Orbit: Pacemaker of the Ice Ages," Science, 194, no. 4270 (1976), 1121-1132.
Hays, James D., 1996: Encyclopedia of Weather and Climate, Oxford University Press, Stephen H. Schneider, ed. pp 507-508.
Lutgens, Frederick K. and Edward J. Tarbuck, 1998: The Atmosphere, Prentice-Hall, Inc., 434pp.
National Research Council, Solar Variability, Weather, and Climate, Washington, D.C.: National Academy Press, 1982, p. 7.