求几篇英文文献资料

1，The measurement of environmental and resource value：theory and methods ，  washington
2，estimation of the benefit of air quality improvement ：an application of  hedonic price technique in seoul， kwak，seung-jun
3，air pollution and mortality rates， christainsen
4，environmental business： market and prospects， kolluru

帖子我看过了，还可以吧，我来帮你的顶顶顶顶顶顶顶顶顶顶的顶顶