Geospectrum / editors Sayani Mukhopadhay , Debdas Ray , Abhik Kundu. - Kolkata : acb publications ,2013. - 367p. ;23cm. ISBN: 8187500700 Subjects--Topical Terms: Earth sciences--Kolkata--Congresses Dewey Class. No.: 550 / M953G Colon Class. No.: U28p4475,P12