00324nam a2200097Ia 4500008004100000082002900041100003300070245006900103260004600172300000800218140113s9999    xx            000 0 und d  a631/635:778:621.039   L0  aNational Academy of Sciences  aRemote sensing with special reference to  agriculture & forestry  a1970bNational Academy of SciencecU.S.A.  a424