Donald L. Coan has been a hydroponics hobbyist for more than 40 years. He is the author of a book entitled: Toward a hydroponic future: Meeting basic human needs; Restoring the environment; Transforming the future.
Seeking simplicity and efficiency of operation in growing food hydroponically, Donald L. Coan designed and built the Gravity-Fed Hydroponic Garden (GFHG).
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