Bibliografía: | ""References""""present status and perspectives of mab biosphere reserves""; ""conclusions""; ""references""; ""ii biodiversity conservation in the participating countries""; ""biodiversity conservation in the united states""; ""introduction""; ""the historical perspective""; ""the current conservation framework""; ""developing an ecological approach""; ""sustaining the environment into the next century""; ""conclusion""; ""references""; ""a strategy for biodiversity protection in poland""; ""introduction""; ""section i""; ""section ii""; ""section iii""; ""conclusion""; ""references"" |