...These Negroes developed theoriginal substratum of culture which later influences modified butnever displaced...
W.E.B. Du Bois 「The Negro」
...As it progressed the substratum of clay became wetter and moredifficult to dig...
Gerard Fowke 「Archeological Investigations」
...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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