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2. British Geological Survey magnetic maps, available athttp://www.geomag.bgs.ac.uk
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4. Drummond, J., Denman, C., Hillman, P., et al. 2007, AMOS Conference Proceedings of the Advanced Maui Optical and Space Surveillance Technologies Conference, Wailea, Maui, Hawaii, September 12-15, E67, ed. S. Ryan, The Maui Economic Development Board