...These Negroes developed theoriginal substratum of culture which later influences modified butnever displaced... 
W.E.B. Du Bois 「The Negro」
...The exposed limestone substratum was overlaid with chalky soil six to eight feet deep...
Erwin E. Klaas 「Summer Birds From the Yucatan Peninsula」
...Local anaesthesia is vouched for in much of the evidence, which suggeststhat there is a substratum of truth in the statements, but I can at presentoffer no solution of this problem...
Margaret Alice Murray 「The Witch-cult in Western Europe」
...The inner coat of themouth-cavity is not provided by the gut-gland layer, but by the skin-senselayer; and its muscular substratum is provided, not by the gut-fibre, but theskin-fibre, layer...
Ernst Haeckel 「The Evolution of Man」
...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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