ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY ALAN SIRULNIKOFF / SCIENCE PHOTO LIBRARY
River cargo. Tug towing a barge of sawdust down a river. Photographed on the north arm of the Fraser River, Canada, as the barge passes Twigg Island. The area is in Vancouver, British Columbia, at the mouth of the river. More sawdust cargoes are seen in the background, as well as floating logs. The sawdust is prepared from logs that are transported downstream from forests in Canada's interior.
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