higway, A. A. o. s. (1980). Interin Specifications Bridges 1980. AASHTO.
Lua i Stíl Chicago (17ú heag.)higway, AMERICAN Assocition of state. Interin Specifications Bridges 1980. AASHTO, 1980.
Lua MLA (8ú heag.)higway, AMERICAN Assocition of state. Interin Specifications Bridges 1980. AASHTO, 1980.
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