File:Nitrogen determination apparatus, part of research conducted during World War II by the Tennessee Valley Authority and the University of Tennessee, 1942.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:13, 20 February 2024 | 706 × 932 (273 KB) | imagescommonswiki>Yann | Cropped 10 % horizontally, 9 % vertically using CropTool with precise mode. |
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