http://orgprints.org/6678/ Henry Doubleday Research Association (HDRA): Experimental /demonstration farm/garden 5 hectare field vegetable production, since 1984 and 5 hectare demonstration gardens, since 1984. 2farming 5vegetables ornamentals uk-hdra Henry Doubleday Research Association (HDRA): Experimental /demonstration farm/garden 2006-01-17 {Facility} HDRA: Henry Doubleday Research Association (HDRA): Experimental /demonstration farm/garden. Facility Leader(s): Nunis, T and Tippens, K, Henry Doubleday Research Association. More information online at <http://www.hdra.org.uk <http://www.hdra.org.uk>>.