D. F. Ball

1927

• The Dumfries basin aquifer
• The sand and gravel resources of the country around Mold, Clwyd
• The sand and gravel resources of the country south of Wrexham, clwyd
• A land characteristic data bank for Great Britain
• A land characteristics data bank for Great Britain
• The soils and land use of the district around Bangor and Beaumaris [Sheets94 and 106]
• The soils and land use of the district around Rhyl & Denbigh (sheets 95 and 107)