Links to reference websites or PDFs
Non-circulating Hydroponics Method, published by the University of Hawaii
Hydroponic Lettuce from the University of Kentucky
Plant culture in Hydroponics, books by Wade Berry and Sharon Knight
Non-circulating Hydroponics Method, published by the University of Hawaii
Hydroponic Lettuce from the University of Kentucky
Plant culture in Hydroponics, books by Wade Berry and Sharon Knight