The Soil and Soil Water 37 



References 



"Soil Fertility." Farmers' Bulletin 257. 



NOTE. The above bulletin and others referred to throughout this 

 book may be secured free by sending a post-card request to the Division 

 of Publications, Department of Agriculture, Washington, D.C. Or 

 the request may be sent to your senator or representative in Congress. 

 In case the free supply through these sources is exhausted, you can 

 always secure single copies for five cents from the Superintendent of 

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