THE SOIL 29 



12. Give an account of the glacial age. 



13. Discuss wind-blown soils. 



14. Discuss the effect of dust storms on soil. 



REFERENCES 

 The Soil, F. H. King. 

 Agriculture, Welborn. 

 Agriculture, Soule & Turpin. 

 Soils, Burkett. 

 Bulletin Extract No. 169, Soil Investigations, U. S. Dept. of Agriculture. 



