File:PSM V68 D252 Evolution of hind cockroach wings through geologic ages.png
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![File:PSM V68 D252 Evolution of hind cockroach wings through geologic ages.png](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/PSM_V68_D252_Evolution_of_hind_cockroach_wings_through_geologic_ages.png/800px-PSM_V68_D252_Evolution_of_hind_cockroach_wings_through_geologic_ages.png?20111029020852)
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