Iowa State University .(English)
Biofuel Impacts on Midwestern Agriculture
Mining of Coal .(English)
Syndicate and its Impact on the Development of Russian Coal Mining Industry.
FAO .(English)
The Effect of Fishing on Species and Genetic Diversity
University of california – Berkeley .(English)
Shrinking Coal Mining Cities: A Comparative Study
Solar in Agriculture .(English)
A detailed study of a solar application
Agriculture .(English)
Value and economic impact
What is the Best Indicator of Work Performed in Agriculture?