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7 Dinerstein, E. Powell, G. Olson, D.M. Wikramanayake, E. Abell, R. Loucks, C.J. Underwood, E.C. Allnut,T. Wettengel, W. Ricketts, T.H. Strand, H. O’Connor, S. Burgess, N. 2000 A workbook for conducting biological assessments and developing biodiversity visions for ecoregion-based conservation: Part I, Terrestrial Ecoregions. Washington D.C. World Wildlife Fund