found: Ed. J. Burrow & Co. Street plan of Blyth, Northumberland, 1987:map cover (Blyth Valley) text accomp. map (Blyth Valley Borough, Borough of Blyth Valley)
found: Barth. gaz. places Brit., 1986(Blyth Valley, admin. dist. of Northumberland)
found: Muni. yr. bk., 1988,v. 2 (Blyth Valley Borough, district, Northumberland)
found: [UK] Communities and local government web site, 20 Aug. 2009:Local Government Re-organisation 2009 page (Northumberland County Council and its lower tier councils have been merged into a new Northumberland Unitary Authority. Its districts no longer exist)