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50.2 MB (4.5 MB compressed)
4168 x 4207 pixels
35.3 x 35.6 cm ⏐ 13.9 x 14.0 in (300dpi)
SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Water purification system, dating back to third century BC. Filtering material is contained within the tubes. Water passes through the filter and is then collected for consumption. Photographed in Empurieus, Spain.
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