but there are different sizes, that travel down the slips;
most are large and heavy, ocean going things,
but some are small and able to go 'round the big ones in rings.
Some are used on the rivers, inland from the sea,
from the Penobscot to the Mississippi, they are there to see,
freeing up the ice for barge traffic to and fro,
breaking up the ice to make the rivers flow.
Bottom: The Cutter Healy with a science party in Antarctic waters.
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