American Association of Equine Practitioners: Great resource for horse-owners:
http://www.aaep.org/info/owners?osCsid=mibc80s6ocagsbiiargq5vi710

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Excellent information on parasite identification and control:

http://www.midamericaagresearch.net/index.php

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The Horse Magazine: 
http://www.thehorse.com/

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Hoard's Dairyman
http://www.hoards.com/

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