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The USDA-ARS Engineering & Wind Erosion Research Unit (EWERU) is not aware of any U.S. copyright protection (see Title 17, U.S.C.) or any other restrictions on the materials on the EWERU Web Pages. The EWERU is providing access to thesematerials strictly for non-commercial, educational and research purposes. The written permission of the copyright owners and/or other rights holders (such as publicity and/or privacy rights) is required for distribution, reproduction, or other use of protected items beyond that allowed by fair use or other statutory exemptions. Responsibility for making an independent legal assessment of an item and securing any necessary permissions ultimately rests with persons desiring to use the item.