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Ultrasonic and Subsonic Pest Control Devices EB1663   Author(s): Leonard Askham This bulletin discusses the effectiveness of ultrasonic and subsonic devices for pest control. The author's verdict--save your money, research shows these devices don't work. Publisher: Washington State University Published: February 1992.   2 pages.   Out of Stock           Free Download: Price: $1.00    See also...  Plants of Washington, Interactive Keys and Color Photos More Info Our Price: $100.00  How to Identify Rhododendron and Azalea Problems More Info Our Price: $6.00  Berries for the Inland Northwest More Info Our Price: $6.00

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