18. Erlckson, James G. 



1952. Age and growth of the black and 

 white crappies, Pomoxis nigro-maculatus 

 (Le Sueur) and P. annularis Raflnesque, 

 in Clear Lake, Iowa. Iowa State College, 

 Journal of Science, Vol. 26, No. 3, pp. 

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19. Eschmeyer, H. W. 



1943. Fish population of a small Norris 

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20. Hansen, Donald F. 



1951 . Biology of the white crappie in 

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21. Hennemuth, Richard C. 



1955. Growth of crappies, bluegill, and 

 warmouth in Lake Ahquabi, Iowa. Iowa 

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 30, No. 1, pp. 119-137. 



22. Johnson, Wendell L. 



1945 . Age and growth of the black and 

 white crappies of Greenwood Lake, 

 Indiana . Investigation of Indiana Lakes 

 and Streams, Vol. 2, No. 15, pp. 297- 

 324. 



23. Juday, Chancey. 



1924. Summary of quantitative investi- 

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24. 1938. Fish records for Lake Wingra. 



Transactions, Wisconsin Academy of 

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25. Kelley, D. W. 



1953. Fluctuation in trap net catches in 

 the upper Mississippi River. U.S. Fish 

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26. Kuehn, Jerome H. 



1949. Statewide average total length in 

 inches at each year. Minnesota Fisheries 



Research Laboratory, Supplement to 

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27. Lewis, William M. 



1950a. Fisheries investigations on two 

 artificial lakes in southern Iowa. 2. Fish 

 populations . Iowa State College Journal 

 of Science, Vol. 24, No. 3, pp. 287-324. 



28. 1950b. Growth of the white bass, Lepibema 



chrysops (Raflnesque) in Clear Lake, Iowa. 

 Iowa State College Journal of Science, Vol. 

 24, No. 3, pp. 273-277. 



29 . Mackenthun , Kenneth M . 



1946. A preliminary report on the age, 

 growth, and condition factor of southern 

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30. 1947 . Age and growth of southern Wisconsin 



bluegills, Lepomis macrochirus. Wis- 

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31. McMiller, P. R. 



1947. Principal regions of Minnesota. 

 University of Minnesota Agricultural 

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32. Meehean, O. Lloyd. 



1932. The structure of scales in relation 

 to the life histories of certain fish from the 

 sloughs of the Upper Mississippi Wild Life 

 and Fish Refuge. M.S. thesis, Univ. 

 of Minnesota , 86 pp . 



33. Moyle, John B. 



1949 . Some indices of lake productivity. 

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34 . 1952. Age and growth of fishes . Iik 

 Minnesota lakes, fish and fishing. 

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51 



