Technician Jeff Nichols collects a water sample from the Walnut Creek Watershed in Ames,Iowa. Samples are collected weekly form this area and surrounding watersheds to study the effects farming practices have on water quality | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / USDA |
Taille de l’image : | 1782 px × 2670 px |
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Property Release : | Non requis |
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