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040 _aBIBLIOTECA UNIBE
_cBIBLIOTECA UNIBE
090 _aMP-0070
110 2 _aNational Geographic Magazine
_9159
245 0 _aEarth dymanic crust
260 4 _aWashington :
_bNational Geographic Society,
_c1985
300 4 _aA color
500 4 _aWith : the shaping of a continent north America's Active West
505 4 _aCiencias sociales
650 _aMAPAMUNDIS
_913389
650 _aAMERICA DEL NORTE
_zMAPAS
_913390
942 _cMP
_2ddc