File:PSM V83 D239 Method of determining the longitudinal power of growth in roots.png
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![File:PSM V83 D239 Method of determining the longitudinal power of growth in roots.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/PSM_V83_D239_Method_of_determining_the_longitudinal_power_of_growth_in_roots.png/504px-PSM_V83_D239_Method_of_determining_the_longitudinal_power_of_growth_in_roots.png?20120823004358)
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