TY - BOOK AU - ECKHOLM,Erik P. TI - Losing ground: environmental stress and world food prospects SN - 0393064107 PY - 1976/// CY - New York PB - Norton KW - Agriculture KW - Environmental aspects KW - Nature KW - Effect of human beings on KW - Food supply KW - Soil erosion N1 - Includes bibliographical references and index ER -