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   "copyrightText": "If you use these data in a publication, presentation, or other product please use the citation below to credit the authors for their contribution to your work. (Please see metadata document's section on use constraints for more details on any additional considerations.) Liknes, Greg C.; Nelson, Mark D.; Kaisershot, Daniel J. 2013. Historical woodland density of the conterminous United States, 1873. Newtown Square, PA: USDA Forest Service, Northern Research Station. http://dx.doi.org/10.2737/RDS-2013-0006",
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