Phosphorite : papers presented in the Fourth International Field Workshop and Seminar on Phosphorite, International Geological Correlation Programme - Project 156 : November 25-27, 1981, Udaipur, Rajasthan, India.
International Field Workshop and Seminar on Phosphorite(4th :1981:Udaipur, India)
Calcutta : Geological Survey of India,
1984.
Phosphate rock.