File:1963. One method of inoculating culture dishes with Bt spores, after dilution of material, to determine viable spore concentration. C.G. Thompson pictured. Corvallis, OR. (34581730892).jpg
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![File:1963. One method of inoculating culture dishes with Bt spores, after dilution of material, to determine viable spore concentration. C.G. Thompson pictured. Corvallis, OR. (34581730892).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/66/1963._One_method_of_inoculating_culture_dishes_with_Bt_spores%2C_after_dilution_of_material%2C_to_determine_viable_spore_concentration._C.G._Thompson_pictured._Corvallis%2C_OR._%2834581730892%29.jpg/800px-thumbnail.jpg?20180504000245)
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