http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tài liệu giới thiệu về các vấn đề chung, công tác chuẩn bị ở dưới bãi, lao lắp dầm thép, sơn dầm thép ...