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Application of "3S" technologies in continuous usage of traditional Chinese medicine resources Estimating Forest Biomass in Western Guangdong Using Landsat TM Data EXPERIMENTAL STUDY ON THE NAVIGATION OFGLOBAL POSITIONING SYSTEM IN FORESTRY A preliminary study on the habitat selection of sable(Martes zibellina) in the autumn Progress and prospect on application of 3S technology in research and management of Chinese materia medica resources