Prairie Agricultural Directory
Thousands of agriculture specific links courtesy of prairielinks.com, originating from Canada.
http://www.prairielinks.com/

Google Directory - Science > Agriculture
The world's most popular search engines' online directory, information provided by the Open Directory Project, ranked and sorted by Google.
http://directory.google.com/Top/Science/Agriculture/

Agriscape - Online Directory of Agriculture
Available in English, Chinese, French and Spanish, Agriscape is a respectable resource mapping the agricultural web in the form of a directory.
http://www.agriscape.com/

Web-Agri Agricultural Search Engine
A pioneer of agricultural search, providing one of the first comprehensive online search engines to index the subject in its own right.
http://www.web-agri.com/

Yahoo Directory - Science > Agriculture
Yahoo's online directory providing reference to numerous agricultural resources available on the web today.
http://dir.yahoo.com/Science/Agriculture/