Losing groundde Erik P. EckholmMateriasFood supplyEnvironmental aspects of AgricultureEnvironmental aspectsAgricultureSoil erosionInfluence on natureHuman beingsNatureEffect of human beings onManInfluencia sobre la naturalezaSuelosEdiciones (2)Losing ground (1978)Pergamon Press · inglésLosing ground (1976)Norton · inglésMás obras de Erik P. EckholmFuelwoodBBy Bread AloneBy Bread AloneCutting tobacco's toll