(1971). Handbook of steel drainage 7 highway construction products (2nd ed.). New York: American Iron and Steel Institute.
Παραπομπή Chicago StyleHandbook of Steel Drainage 7 Highway Construction Products. 2nd ed. New York: American Iron and Steel Institute, 1971.
Παραπομπή MLAHandbook of Steel Drainage 7 Highway Construction Products. 2nd ed. New York: American Iron and Steel Institute, 1971.
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