00375nam a2200109Ia 4500008004100000040003800041100005400079245004900133260004100182300002400223653001800247211217s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aGeological Survey Of India Misc Publication No 20 0aCode of stratiographic nomenclature of india  bManager of PublicationsaDelhic1971  aiii, 28, ivp fig p.  aGeology-India