10. Haas, H. J., Willis, W. O., and Boat- 



wright, G. O. Moisture Storage and 

 Spring Wheat Yields on Level- Bench 

 Terraces as Influenced by Contribut- 

 ing Area Cover and Evaporation Con- 

 trol. Agron. Jour. 58: 297-299. 1966. 



11. Hauser, Victor L. Conservation Bench 



Terraces in Texas. Amer. Soc. Agr. 

 Engin. Trans. 11(3): 385-386, 392. 

 1968. 



12. Haynes, Howard. Machinery Methods 



for... Drainage on Farm Lands. Amer. 

 Soc. Agr. Engin. Trans. 9(2): 185-193. 

 1966. 



13. Houston, Clyde E. Trends and Costs of 



Land Grading for Irrigation in Cali- 

 fornia. Amer. Soc. Agr. Engin. 

 Trans. 9(4): 565-567. 1966. 



14. Jacobson, Paul. New Developments in 



Terrace Systems. Amer. Soc. Agr. 

 Engin. Trans. 9(4): 576-577. 1966. 



15. Larson, Kermit E., Bahr, A. F., Frey- 



miller, William, and others. Soil 

 Survey, Stark County, North Dakota. 

 Soil Cons. Serv., U.S. Dept. Agr. 

 1968. 



16. Lynne, Gary Dean. A Determination of 



Water Value Estimates for Brome- 

 grass and Corn Silage Production in 

 North Dakota. M.S. Thesis. N. Dak. 

 State Univ., 1969. 



17. McMartin, Wallace, and Bergan, Ronald O. 



Irrigation Practices and Costs in 

 North Dakota. N. Dak. Agr. Expt. 

 Sta. Bui. No. 474. 1968. 



18. Mickelson, Rome H. Conservation Bench 



Terraces in Eastern Colorado. 

 Amer. Soc. Agr. Engin. Trans. 11(3): 

 389-392. 1968. 



19. Snider, Arlin E., Bauer, Armand, and 



Norum, Enoch B. Growing Season 

 Precipitation Probabilities in North 

 Dakota. N. Dak. Agr. Ext. Serv. Bui. 

 No. 4. 1968. 



20. Ulvilden, James, and Benrud, Charles H. 



Farm Labor, Power, and Machinery 

 Performance. S. Dak. Agr. Expt. Sta. 

 Cir. 131. 1956. 



21. U.S. Census of Agriculture, 1964. Statis- 



tics By Subjects — Chapter 9, Irri- 

 gation, Land Improvement Practices, 

 and Use of Agricultural Chemicals. 

 U.S. Govt. Printing Off., Washing- 

 ton, D.C. 1968. 



22. Zaylskie, John J. Modified Windbreaks 



Control Wind, Snowdrift. N. Dak. 

 Agr. Expt. Sta. Farm Res. Bimo. 

 Bui. 24(9): 4-6. 1967. 



23. Zingg, A. W., and Hauser, V. L. Terrace 



Benching to Save Potential Runoff for 

 Semiarid Land. Agron. Jour. 51: 289. 

 1959. 



