Development (1) Agriculture (1) Agricultural intensification (1) Land mines (1) Piping (1) Groundwater (1) Ultimate (Game) (1) Perspective (1) Natural resources (1) Mining engineering (1) Mines and mineral resources (1) Mines (Military explosives) (1) Flying discs (Game) (1) Economics (1) Causation (1) Use studies (1) Use studies (1) Movements (1) Influence (1) Race identity (1) Ethnic identity (1) Peace (1) Tuberías--Diseño y construcción (1) Identidad cultural (1) Tecnología minera (1) Perspectiva (1) Causalidad (1) Minas militares (1) Paz (1) Aguas subterráneas (1)