Crop Species Diversity Changes in the United States: 1978–2012

• Jonathan Aguilar,

  Affiliation Southwest Research and Extension Center, Kansas State University, Garden City, Kansas, United States of America

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• Greta G. Gramig,

  Affiliation Department of Plant Sciences, North Dakota State University, Fargo, North Dakota, United States of America

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• John R. Hendrickson ,

  * E-mail: john.hendrickson@ars.usda.gov

  Affiliation Northern Great Plains Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Mandan, North Dakota, United States of America

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• David W. Archer,

  Affiliation Northern Great Plains Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Mandan, North Dakota, United States of America

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• Frank Forcella,

  Affiliation North Central Soil Conservation Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Morris, Minnesota, United States of America

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• Mark A. Liebig

  Affiliation Northern Great Plains Research Laboratory, Agricultural Research Service, United States Department of Agriculture, Mandan, North Dakota, United States of America

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