The sand and gravel resources of the country around Hexham, Northumberland - Description of 1:25 000 resource sheet NY 86 and 96
Lovell, J.H.
The sand and gravel resources of the country around Hexham, Northumberland - Description of 1:25 000 resource sheet NY 86 and 96 - 1 - 62 - Etude de photo-interprétation .
The sand and gravel resources of the country around Hexham, Northumberland - Description of 1:25 000 resource sheet NY 86 and 96 - 1 - 62 - Etude de photo-interprétation .