Grasslands, Ecosystems, Habitats, and the Future

References:

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Great Plains Nature Center, 2007. Prairies of the world.

National Geographic. 2007. Habitats.

Post, W. M., R. C. Izaurralde, J. D. Jastrow, B. A. McCarl, James E. Amonette,
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USDA-NRCS. 2003. National Resources Inventory 2001 Annual NRI Urbanization and Development of Rural Land. 4 pp.