@book{23063,
	author = {Mukhopadhyay, Anandadeb. and Bhattacharya, Harendra Nath.},
	title = {Hostory of Science in India , Vol. - VI, ( Earth Science )},
	publisher = {Ramakrishan Misson Institute of Culcutta},
	year = {2014},
	address = {Kolkata}
}