...Whether these render the leather impervious,I am not competent to say; every inquirythat I have made at Marocco respecting thisbeautiful manufacture, has been unsatisfactory... 
Abd Salam Shabeeny 「An Account of Timbuctoo and Housa Territories in the Interior of Africa」
...This native cotton cloth, whendoubled, makes tents impervious to the summer rain...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...These present an airy, cool, and light appearance, highly suitable to a tropical region, and yet are impervious to rain...
Horatio Bridge 「Journal of an African Cruiser」
...Another point to be guarded against is the supply ofwater that has drained from marshes or impervious soils, rich in organicmatter, as such water is charged with nitrites, ptomaines, etc...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The rock strata are relatively impervious towater, which is held at a depth where it is readily available to thetrees...
Henry S. Fitch 「The Forest Habitat of the University of Kansas Natural History Reservation」
...But the verytensile strength of the beetle-shells,which rendered them impervious tobullets, required a laminate constructionwhich rendered them powerlessagainst brick or stone...
Various 「Astounding Stories of Super-Science February 1930」
...Two or threeof the Robots ran into that next block—ran impervious to the manyshots which now were fired at them...
Various 「Astounding Stories, April, 1931」
...That this opinion comes neerer to the truth thanthat common one of Aristotle which hath to no purpose filled theheavens with such reall and impervious Orbes...
John Wilkins 「The Discovery of a World in the Moone」
...The water is no doubt permanent, forit is supplied by the drainage of the sandhills that surround it, and itrests on a substratum of impervious clay...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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oceanography fledgling erosion
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