00323nam a2200121 a 450000500170000002000150001708200160003210000060004811000200005424500650007426000410013930000210018020251203110056.0  a1559634766  a333.72bDAI  d_  aDaily, Gretchen  aNature's ServicesbSocietal dependence on Natural ecosystems  aWashington, D.C.bIsland Pressc1997  axx,392p.c23 cm.