94 PRACTICAL CORN CULTURE 



ADDITIONAL READING 



"Phosphorus Results." By O. S. Fisher. Illinois State Reg- 

 ister. September 20, 1913. 



"The Salvation of Our Soil." By B. E. Powell. Successful 

 Farming, February, 1913. 



"Frank Mann's Soil Book." By Frank I. Mann. (Mr. Mann 

 is a practical farmer actively engaged in farming.) 



"Results of Scientific Soil Treatment." By Mann and Hop- 

 kins. 111. Agri. Ex. Sta., Bulletin 149. 



"The Fertility of the Land." By Isaac Phillips Roberts. 



