Utilization of tree species by forest birds during winter and summer in secondary deciduous woods 次生阔叶林中某些鸟类对树种利用的研究
2.
Regulations governing the use of timber in structure . visual classification for the use of the main coniferous and deciduous wood types in structures 结构用木材使用的控制规则.结构用主要松柏类和落叶类木材使用的目视分类