Sample Map This atlas of Hatfield, Hertford and Welwyn Garden City has 42 pages of coloured street mapping. The Hatfield and Welwyn Garden City coverage extends to Old Knebworth, Knebworth, Datchworth, Bull's Green, Tewin, Cole Green, Essendon, Newgate Street, Cuffley, Goff's Oak, Potters Bar, South Mimms, Colney Heath, Hatfield Aerodrome, Ayot Little Green and Codicote. The Hertford coverage extends to Waterford, Chapmore End, Ware, St. Margarets, Rye Meads, Hoddesdon, Hertford Heath, Hertingfordbury and Broadoak End. The index section of the atlas lists streets, selected flats, walkways and subsidiary names, junction names, place and area names, hospitals and hospices and selected places of interest.