D. P. Piper

• Procedure for the assessment of the conglomerate resources of the Sherwood Sandstone Group
• The conglomerate resources of the Sherwood Sandstone Group of the country east of Stoke-on-Trent, Staffordshire
• Ceramic clay resources, Mariental
• Ceramic clay resources, Mariental
• Industrial mineral resources for Namibia
• Industrial minerals in the Namibian economy
• International trade in industrial minerals
• Namibia's principal industrial mineral deposits
• Namibian imports of industrial minerals