005830000a22002170004500650001900000650001600019650003100035650002200066650002500088650002300113082002000136530000600156100002600162110006800188245004700256020001800303260001800321260000900339300000900348041000800357  aLand economics  aEnvironment  aEnvironmental conservation  aHuman environment  aCultural environment  aSocial environment  a333.7bUn3pcUN  aM  aGallopin, Gilberto C.  aUnited Nations Educational Scientific and Cultural Organization  aPlanning methods and the human environment  a92-3-101894-9  aParisbUNESCO  c1981  a67p.  aEng