| title | ISBN-13 | year of publication |
|---|---|---|
| History of the Portuguese navigation in India, 1497-1600 | 978-81-7099-046-8 | 1988 |
| Manorama Yearbook, 2001 | 978-81-900461-3-8 | 2001 |
| Manorama Yearbook, 2003 | 978-81-900461-8-3 | 2003 |
| The Flora of the Palni Hills - 3 Vols. ; South India | 978-81-900539-3-8 | 1999 |
Malayala Manorama · Mittal Publications · The Rapinat Herbarium