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https://www.noaa.gov/media/digital-library-photo/pl23fizh0298jpgDescription
A specially-designed ice-breaking dock to permit handling of experimentalanimals in northern climate during winter. The sheet of ice setting over thisdock in winter is broken at low tide. Therefore, it leaves the open space overthe dock, which allows handling of baskets suspended from the dock. (Image credit: NOAA Central Library Historical Fisheries Collection)