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Oskar Augustus Johanssen
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INTRODUCTION EARLY SUGGESTIONS REGARDING THE TRANSMISSION OF DISEASE BY INSECTS Until very recent years insects and their allies have been considered as of economic importance merely in so far as they are an annoyance or direct menace to man, or his flocks and herds, or are injurious to his crops. It is only within the past fifteen years that there has sprung into prominence the knowledge that in...
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