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Trease and Evans Pharmacognosy
from the earliest times man and animals have had to distinguish between thouse plants which are poisonouse and those which are not . and thee has gradually developed a knowledge of naturally occurring drugs which was transmitted at one time orally ,later in witten form as papyri baked clay tablets , parchments , manuscript herbals , printed herbals , pharmocopoeias and other wprks, and most recently by computerizer information retrival syistem
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