00419nam a2200121Ia 4500008004100000082001900041100001600060245008900076260003700165300001500202600001400217650006600231140224s9999    xx            000 0 und d  a577.4.008.2 L3  aUsher, M.B.  aBiological management and conservation; ecological theory, application and planning.  aLondonbChapman and Hallcc 1973  axiii,394p.  aM.B.Usher  aConservation of natural resources,Resource management,Ecology