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1. Baker, D. G. and J. B. Swan. 1966. Climate of Minnesota. Part IV. Spring 
     Soil Temperatures. University of Minn. Agr. Exp. Sta. Misc. Report 67.
     11 p.
    
2. Bavendick, F. J. 1952. Climate and Weather in North Dakota. North 
     Dakota State Water Conservation Commission, Bismarck, North Dakota. 
     126 p.
    
3. Black, R. E. 1971. A Synoptic Climatology of Blizzards on the North-
     Central Plains of the United States. NOAA Tech. Memo. NWS CR-39. 
     38 p.
    
4. Chagnon, Stanley. 1952. Hail Climatology of the Central U. S. Illinois
     Water Survey, Urbana.
    
5. Decker, Wayne L. 1967. Temperatures Critical to Agriculture. N.C. Reg. 
     Res. Pub. No. 174. 76 p.
   
6. Sanderson, C. J. 1963. The Probability of Freezing Temperatures in Spring 
     and Fall in North Dakota. N. D. State Univ. Agric. Exp. Sta. Bull. No. 
     443. 23 p.
    
7. U. S. Department of Commerce Weather Bureau. 1954. Climatic Summary of the
     United States-Supplement for 1931-52. Climatography of the U. S. No. 
     11-17. U. S. Govt. Print. Office, Washington, D. C.
    
8. United States Department of Commerce Weather Bureau. 1956. Summary of 
     Hourly Observations for Fargo, N. D. and Bismarck, N. D. Climatography
     of the United States No. 30-32. U. S. Govt. Printing Office, Washington, D.C.                   
    
9. U. S. Department of Commerce Weather Bureau. 1959. Climate of the States-
     Minnesota. Climatography of the U.S. No. 60-32, U. S. Govt. Printing 
     Office, Washington, D. C.
    
10. U. S. Department of Commerce Weather Bureau. 1962. Decennial Census of 
     United States Climate-Monthly Normals of Temperature, Precipitation, and 
     Heating Degree Days. Climatography of the U.S. No. 81-28. U.S. Govt. 
     Printing Office, Washington, D. C.
    
11. U. S. Department of Commerce Weather Bureau. 1965. Climatography of the 
     U. S. No. 86-32, Climatic Summary of the U.S., 1951-1960, for North Dakota. 
     U. S. Govt. Printing Office, Washington, D. C.
    
12. U.S. Department of Commerce Weather Bureau. 1969. Severe Local Storm 
     Occurrences 1955-1967. ESSA Technical Memo WBTM FCST 12. 77 p. Washington,
     D. C.
    
13. U. S. Department of Commerce National Weather Service, 1971. North Dakota 
     Climatological Records. On file at National Weather Service Office for 
     State Climatology, North Dakota State University, Fargo.

14. U. S. Department of Commerce National Weather Service Storm Data. Monthly 
    Publication, U. S. Government Printing Office, Washington, D. C.