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Kupfer, C. A. (3834) 



treelessness of the plains. Iowa Agr. 5: 331-332. 1905. 



Lesquereaux, Leo. (3835) 



on the origin and formation of prairies. Amer. Jour. Sci. (2) 39 I 317- 

 327; 40: 23-31. 1865-66. 



(3836) 



on the origin and formation of the prairies. 111. State Geol. Survey 1 : 



238-254. 1866. 



Lutz, H. J. (3837) 



observations on the invasion of newly formed glacial moraines by trees. 

 Ecology 11 : 562-567, illus. 1930. 



McGuire, W. W. (3838) 



on the prairies of Alabama. Amer. Jour. Sci. 26 1 93-98. 1834. 



Macoun, John, Robinson, Jabel, Fletcher, , Drummond, , Saun- 

 ders, , and Fernow, B. E. (3839) 



the second discovery of the west. Canad. Forestry Assoc, Ann. Kept. 3: 

 59^70. 1902. 



Maxwell, Htj. (3840) 



an indiana desert; a curious region of constantly changing character. 

 Sci. Amer. Sup. 80: 248-250, illus. 1915. 



Meehan, Thomas. (3841) 



treeless prairies, Bot. Gaz. 6: 253, 1881. 



Miller, A. M. (3842) 



origin of the prairie. Science 66: 655-656. 1927. 



Mitchell, Archibald. (3843) 



the why of the prairie. Canad. Forest and Outdoors 22 (1) : 28-29. 

 1926. 



Newberry, J. S. (3844) 



origin of the prairies. Ohio Geol. Survey Kept. 1 (1) : 26-31. 1873. 



Nutt, Rush. (3845) 



on the origin, extension and continuance of prairies. Amer. Jour. Sci. 

 (1) 23: 40-45, 58-59. 1833. 



Pool, R. J. (3846) 



the invasion of a planted prairie grove. Soc. Amer. Foresters Proc 10: 

 1-8, illus. 1915. 



Weaver, J. E., and Jean, F. C. (3847) 



further studies in the ecotone between prairie and woodland. Nebr. 

 Univ. Studies 18 (2) : 1-47. 1918, 



Potter, Hugh. (3848) 



some forestry problems of the prairies of the middle west. Iowa Acad. 

 Sci. Proc. 15 : 91-95. 1908. 



Pound, Roscoe, and Clements, F. E. (3849) 



the vegetation regions of the prairie province. Bot. Gaz. 25: 381-394. 

 1898. 



Records, P. C. (3850) 



THE BOUNDARY LINE BETWEEN FOREST AND PRAIRIE IN MINNESOTA. Minn. State 



Forester Rept. 3 : 115-120. 1913. 



SOHAFFNER, J. H. (3851) 



THE CHARACTERISTIC PLANTS OF A TYPICAL PRAIRIE. Ohio Nat. 13: 65-69. 



1913. 

 Shantz, H. L. (3852) 



THE NATURAL VEGETATION OF THE GREAT PLAINS REGION. Ann. ASSOC. Amer. 



Geogr. 13 (2) : 81-107. 1923. 



Shimek, Bohumil. (3853) 



an artificial prairie. Iowa State Lab. Nat. Hist. 6 (4) : 35-41. 1913. 



(3854) 



prairie openings in the forest. Iowa Acad. Sci. Proc. 17 : 16-19. 1910. 



