Explanation handbook of specifications for design of highway subgrades Application handbook of technical specification for construction of highway subgrades Explanation handbook of specification of seismic design for highway engineering 中华人民共和国行业标准 公路路基设计规范 = Specifications for design of highway subgrades Application handbook of specifications for drainage design of highway 中华人民共和国行业标准 公路路基设计规范 = Specifications for design of highways subgrades 中华人民共和国行业标准 公路路基设计规范 = Specifications for design of highway subgrades:eng Application handbook of technical guidelines for construction of highway roadbases Application handbook of specifications for highway construction supervision Application handbook of technical specification for construction of highway cement concrete pavements