Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 444
r-breathinganimal that prefers to stay on the surface, onlyoccasionally diving under to hide from danger orto steal upon its prey. Probably submarines donot average more than three hours per day com-pletely submerged. A U-boat cannot float under water withoutswimming; in other words, it must keep…
Children's literature
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