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The name was given by Charles Wilkes during the Wilkes Expedition of 1838-1842, describing the island's terrain. During World War II, the island was used for practice bombing, using sacks of flour.
- U.S. Geological Survey Geographic Names Information System: Flattop Island
- Phillips, James W. (1971). Washington State Place Names. University of Washington Press. ISBN 0-295-95158-3.
- Reigel, page 519
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