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Sep21 14 Last Modified: 2014-09-21 13:16:51 https://serc.carleton.edu/download/files/55135/fact_sheet_student_handout.v2.pdf
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Unit 6 https://serc.carleton.edu/integrate/teaching_materials/sustain_agriculture/student_materials/unit_6.html
Provenance Hannah Scherer, Virginia Polytechnic Institute and State Univ
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Fact Sheet Student Handout (pdf version)