553.93
I39P
               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 - Calcutta : Geological Survey, 1984.
               vii, 210p. - Geological survey of India special publication; no. 17 .
121617
                Subjects: Phosphate rock; Geochemistry; Phosphatic fertilizers.