By Sweeney Daniel   Moyer Joseph   Jardine Douglas   Whitney David   in Journal of Plant Nutrition

ISSN:0190-4167|34|9|1330-1340

Taylor & Francis Ltd‎(2011)‎

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By Douglas Whitney   Fry Sara W.   Wilhelm Jeffrey D.   Housley Angela   in Social Studies and the Young Learner

ISSN:1056-0300|27|4|27-30

National Council for the Social Studies‎(2015)‎

Access to resources Favorite 7.266563