DAMAGE TO RANGE GRASSES BY THE ZUNI PRAIRIE DOG 15 



LITERATURE CITED. 



Bell, W. B. 



1921. Death to the rodents : U. S. Dept. Agr., Yearbook 1920, pp. 421-438 ; 

 several unnumbered figs. 

 Clements, F. E. 



1905. Research methods in ecology: Lincoln, Univ. Pub. Co., pp. xvii+334, 



85 figs. 

 1920. Plant indicators : the relation of plant communities to process and 

 practice : Carnegie Inst. Washington, Pub. 290, pp. xvi+388, 92 

 pis., 25 figs. 

 Hollistee, N. 



1916. A systematic account of the prairie clogs : U. S. Dept. Agr., Bur. 

 Biol. Surv., North Amer. Fauna No. 40, pp. 37, 7 pis., 2 figs. 



LOFTFIELD, J. V. G. 



1924. Plant successions on grazing ranges in northern Arizona. (In MS.) 

 Meeriam, C. Hakt. 



1902. The prairie dog of the Great Plains: U. S. Dept. Agr., Yearbook 

 1901, pp. 257-270, pis. 22-24, figs. 24 and 25. 

 Nelson, E. W.. 



1918. Annual report of chief of Bureau of Biological Survey (pp. 1-19) : 



In Annual reports of the Department of Agriculture for the year 

 ended June 30, 1918, pp. 257-275, 1919. 



1919. Annual report of chief of Bureau of Biological Survey (pp. 1-24) : 



In Annual reports of the Department of Agriculture for the year 

 ended June 30, 1919, pp. 275-298, 1920. 

 Shaw, W. T. 



1920. The cost of a squirrel and squirrel control : Agr. Exp. Sta., State 



Coll. Washington, Pop. Bui. No. 118, pp. 1-19, 11 figs. 

 Taylok, W. P. 



1920. Suggestions for ecologic investigations in vertebrate zoology : Sci- 

 ence, v. 51, no. 1316, pp. 283-287, Mar. 19 



