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MIS3b vegetation and climate changes based on pollen and charcoal on Qianxi Plateau Paleo-Vegetation Type Predicting by Experiment of Carbon Isotope in Loess Preliminary Study on Paleovegetation and Environmental Changes Since 11ka B.P. in Diaojiaohaizi Lake area, Daqing Mountains , Inner Mongolia A Preliminary Study of Spore-Pollen Society and it’s Development Process to T302 Pole Section,in Liuhe,Jilin Middle Jurassic Spore- pollen Assemblages from Turpan- Shanshan Area, Xinjiang