Throckley, spoil heap of Thristle Pit

English Heritage, 2008, Hadrian's Wall National Mapping Programme (1440540); Aerial Photograph RAF/58/2685/F22 167 23-Jan-1959; A Plan of Throckley, 1769, NRO 536/2; Thompson, 1767, A plan of the Lordship of Newburn belonging to the Duke and Duchess of Northumberland, NRO Sant/Beq/9/1/1/24, Plan of the Throckley Estate in the County of Northumberland - freehold lands… formerly belonged to John Rogers Esq. now to Edward Montague Esq., 1736, NRO Sant/Beq/9/1/1/35; Throckley Estate and the workings in the Engine Seam of coal situated in the parish of Newburn belonging to Greenwich Hospital, NRO Sant/Beq/9/1/1/37