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, , , , , , and (Manduca, C. A., E. Baer, G. Hancock, R. H. Macdonald, S. Patterson, M. Savina, and J. Wenner (2008), Making Undergraduate Geoscience Quantitative, Eos Trans. AGU, 89(16), 149–150, doi:10.1029/2008EO160001.