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tissue culture micropropagation in vitro studies biotechnology baliospermummontanum (willd) prairie rangeland mangemrnt grasslands physical chemical and biological management a.r sampson types of rangeland rangeland use of rangeland peat wetland types ramsar classification fen kulathoopuzha bog cowardin classification swamp forest mineral soil wetland wetland formation organic soil wetland school of environmental science mg university midhun m nair drugs drugs mode of action microbiology antibacterial agents environmental microbiology