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If you ever thought buy organic wasn't worth the cost, think again. Not to mention you won't be poisoned with chemicals.
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http://www.libraries.rutgers.edu/rul/ask_a_lib/faqru.shtml#fb

(emphasis mine)
"""

The purpose of the study was to compare the mineral composition of vegetables from regions of the United States. Samples of cabbage, lettuce, snapbeans, spinach, and tomatoes were obtained from commercial fields and analyzed for mineral composition.
The authors report variations in mineral composition and use of fertilizers within these regions. This study is often misrepresented as evidence supporting the position that organically grown foods are superior in minerals and trace elements to those grown conventionally. In fact, the study did not compare synthetic fertilizer practice to organic.
"""
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