Dig it! The Secrets of Soil. Educators Guide
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NACD/FAO ;
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DIG IT! soil education materials were developed by NACD based on an exhibition developed by the Smithsonian’s National Museum of Natural History and sponsored by the Soil Science Society of America and the Nutrients for Life Foundation. This version was prepared by the Food and Agriculture Organization of the United Nations (FAO) under a license agreement with NACD