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W-31 The Conservation and Improved Use of Nitrogen in Western Soils . 

 See ARS-23-S-21-a . 



W-39 Effects of Fluorine (as Fluorides) on Plants. Animals and Soils . 

 See ARS-23-8-18. 



W-47 Developmental aspects of Root Growth in Forage Plants . 

 See ARS-23-8-10. 



