acte législatif (1) province (1) extraction (1) Afrique (1) point (1) Afrique Centrale (1) grotte (1) Afrique (1) Implements (1) Comparative studies (1) Description and travel (1) Antiquities, Prehistoric (1) Stone age (1) Social sciences (1) Quartz crystals (1) Quartz (1) Process (Law) (1) Manufacturing processes (1) Prehistoric peoples (1) Example (1) Crystals (1) Continuity (1) Comparative studies (1) Africa, Central (1) Africa (1) Utilization (1) Use (1) Structure (1) Behavior (1) grotte (1)