Assessment and Management of Air Quality for an Opencast Coal Mining Area

ανά Chaulya, S. K., Chaulya, S. K.
Έκδοση 2003

The Problem of Displaced People: A Study in the Coal Mines of Brajraj Nagar, Sambalpur, Orissa

ανά Panda, P., Panda, P.
Έκδοση 1989