Excellent source of information for recirculating hydroponics methodology from Utah State University.

Interactive web site from the University of Arizona provides practical, accurate information on growing hydroponic tomatoes for students, hobbyists, and beginning growers.

Gary V. Deutschmann covers the history and future of hydroponic gardening.

An excellent introduction to the hydroponic methodology from the Virginia Cooperative Extension.

Book on small scale cultivation of green fodder via the hydroponic method. Website in Spanish and English.

The Hydroponic Gardening page at Suite101.com, a community site. Offers articles, links and discussions pertaining to hydroponics.

Details of setting up and running a lettuce production facility using Controlled Environment Agriculture techniques. Illustrated with descriptive photos. Cornell University.

Non-profit organization dedicated to the exchange of information in the field of hydroponics. Members include educators, researchers, vendors, commercial growers and hobbyists.

A circular from the Extension at University of Illinois at Urbana-Champaign, offers a basic history and guide to hobby hydroponics.

Photographic presentation of hydroponics project at Colorado State University.

Secrets for starting hydroponic businesses. Includes information about hydroponic nutrients, maintenance, production, greenhouses, and marketing.

Dedicated to supporting efforts to use simplified hydroponics to reduce global hunger and poverty. Offers classes and activities to support the education of simplified hydroponics, especially in developing nations.

Publication by the Controlled Environment Agricultural (CEA) Program of the College of Agriculture and Life Sciences at Cornell University. An electronic handbook for the production of CEA hydroponic spinach.

A research report issued by the Perlite Institute, Inc. by Dr. David A. Hall, Principal of the Pershore College of Horiculture in the United Kingdom

A bimonthly magazine dedicated to hydroponics, aquaponics, and greenhouse growing. Provides a wealth of free information for soilless growers.