Substruction
Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 435
sub-strukShun, re. Under-building; foundation. — Substructure, -chur, re. An under structure; a foundation.
Bu kavram başka kaynaklarda da geçiyor
French-English Dictionary of Military Terms (1918)
The American Dictionary and Cyclopedia (1910)
Nuttall's Standard Dictionary of the English Language (1890)
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