The Pocket Gopher. 



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Typical area of a badly infested alfalfa field. This tract (54 ft. x 72 ft.) was 

 carefully mapped after first dividing it into small squares by tightly stretched lines. 

 "The small irregular patches show the shape, relative size and location of the mounds 

 thrown up by the gophers. 



Same tract as above, with all the runways carefully excavated and mapped. 



