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Ultrasonic sound systems on buildings repel birds harmlessly

Topic: 
ANIMAL CONTROL
Author: 
Delaney, R. W.
Publisher/Date: 
1998
Note: 
In Public Works - Vol. 129 - no. 8 (July 1998).
Summary: 
Unwanted birds were causing messy, dangerous, unhealthy conditions and increasing financial outlays for repairs and cleaning at two government facilities.

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