...He has marshalled his data with great skill, and has dissected out, as it were, the physical and cultural elementsof the Negrito substratum...
Robert W. Williamson 「The Mafulu」
...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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