Contents: Foreword. 1. Central Headquarters. 2. Central Petrological Laboratories. 3. Palaeontology Division- I. 4. Palaeontology Division- II. 5. Geochronology and isotope geology division. 6. Geodata and database division. 7. Photogeology and remote sensing division. 8. Central geophysics (exploration) division. 9. Antarctica division. 10. Airborne mineral surveys and exploration wing. 11. Geophysics division. 12. Airborne survey division. 13. Geophysical mapping centre. 14. Geophysical interpretation cell -I. 15. Geophysical interpretation cell -II. 16. Geophysics instrumentation division. 17. Photogeology and remote sensing division. 18. Petrology, petrography and ore-dressing division. 19. Central zone. 20. Eastern zone. 21. Western zone. 22. Southern zone. 23. North Eastern zone. 24. Coal wing. Project I. Damodar Valley Coalfield, West Bengal and Jharkhand. Project II.  Rajmahal - Birbhum Masterbasin, West Bengal and Jharkhand. Project III. Mahanadi Valley Coalfield, Orissa. Project IV. Mahanadi Valley Gondwana Basin Coalfield, Chhattisgargh. Project V. Son Valley Coalfield (East) Chhattisgarh and Madhya Pradesh. Projects VI. Son Valley Coalfields (West) Madhya Pradesh. Project VII. Wardha and Tawa Valley Coalfield, Madhya Pradesh. Project VIII. Godavari Valley Coalfield, Andhra Pradesh. Project IX. Lignite of Tamil Nadu, Rajasthan, Gujarat, Jammu-Kashmir and Kerala. 25. Environmental geology division. 26. Photogeology and remote sensing division. 27. Petrology and palaeontology division. 28. Geodata division. 29. Geophysics division. 30. Marine wing. 31. Petrology division. 32. Palaeontology division. 33. Operation East Coast - I. Project X. TW and EEZ of Andaman and Nicobar Islands. Project XI. TW off West Bengal and Orissa. Project XII. Coastal geotechnics (West Bengal and Orissa). Project XII. Geoenvironmental studies. 34. Operations East Coast - II. 35. Operation West Coast - I. 36. Operation West Coast - II. 37. Training Institute. Authors index.