...Harding, Gideon, Spilett, Herbert, Pencroft, and Neb postedthemselves in impregnable line... 
Jules Verne William Henry Giles Kingston 「Abandoned」
...“Belle-Isle is impregnable...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...That is an impregnable place of refuge...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...Its tough, armoredhide was impregnable to their knife thrusts while their thrown clubsrattled from it as futilely as if hurled at the rocky shoulder ofPastar-ul-ved...
Edgar Rice Burroughs 「Tarzan the Terrible」
...Thesituation was almost impregnable, being everywhere surroundedwith high precipices, except on the eastern side, where thenatives had left a pathway sufficient to allow one person at atime to ascend...
Mungo Park 「Travels in the Interior of Africa, Vol. 2 [of 2]」
...Instead of endeavoring to render Paris impregnable, try rather to render the loss of Paris an insignificant matter...
P. J. Proudhon 「What is Property?」
...If they wish the trade to continue, let it bebased on the impregnable ground that the merchants want the money,and not on a fantastic dream that is too silly to deceive even achild that knows birds...
William T. Hornaday 「Our Vanishing Wild Life」
...Built up at haphazard, all these things make an impregnable wall...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... These pear-shaped hollows form splendid lodgings, impregnable strongholds, in which the Osmiae find a safe and commodious retreat for their families...
J. Henri Fabre 「Bramble-bees and Others」
...Its rocks and caverns seem to have proved as impregnable a garrison to them as to the British...
Samuel Griswold Goodrich 「Illustrative Anecdotes of the Animal Kingdom」
...On the southern portion of this impregnable site and grouped about apoint where nearly the whole drainage of the mesa top collects, arefound the village remains...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...Edessa was from its position a fortressof the first rank and reputed impregnable...
Various 「The American Journal of Archaeology, 1893-1」
..."We're impregnable here...
Various 「Astounding Stories, July, 1931」
...o the Ralas have ruled from this impregnable amphibian city...
Various 「Astounding Stories of Super-Science, August 1930」
...This ancient and impregnable fact has been ignored...
Dr. D.M. Brooks 「The Necessity of Atheism」
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