A VILLAGE PELICANRY - 1947 

AMBALAMEDU - A DUCK SANCTUARY - 1988 

BIRDS & ENVIRONMENTAL POLLUTION 

BIRDS OF A HILL - 1947 

BIRDS ON THE GODAVARI - 1947 

BUDDING ETHOLOGIST - 1975 

CONSERVATION OF AREAS OUTSIDE PROTECTED AREAS - 1977 

DIARY OF A NATURALIST - 1957 

ENGLISH AS FOREIGN LANGUAGE 

GLIMPSES OF BIRDS OF PERIYAR. PTR GOLDEN JUBILEE - 1985 

HOW DO BIRDS BUILD THEIR NESTS - 1980 

INFINITE RICHES IN A LITTLE ROOM - WWF Newsletter

KAIRALI BOOK TRUST AWARD SPEECH - സംക്ഷിപ്ത സമ്മാനചരിത്രം - 1981

KALAKAUMUDI - BIRD SONGS 

KALAKAUMUDI - FUTURE OF MANKIND 

KALAKAUMUDI - ON WETLANDS

KERALATHILE PAKSHIKAL - BNHS REVIEW by N G PILLAI 

KUMARAKOM - 1984 

MIGRATORY BIRDS- PART 1 - 1967 

MIGRATORY BIRDS- PART 2 - 1967 

MONSOON IN MALABAR - 1947 

NOTES ON THE TUNNEL WEB SPIDER - 1942 

ON THE COURTSHIP OF BIRDS - 1969 

PAKSHI NIREEKSHANOM - MATHRUBHUMI - 1955 

PATHETIC FLIGHT OF THE PELICAN - 1993 (Reproduced) 

PEACOCK JOURNAL - 1965 

SHAKESPEAR'S TRAGEDIES - 1964 

SUGGESTIONS - WILDLIFE BOARD 1974 

TALK IN TAMIL TO A GROUP OF WOMEN IN POINT CALIMERE - 1980 

THE CONSERVATION OF NATURE 

THAMBARAM SPIDER - 1942 

THIRUKOCHIYILE PAKSHIKAL - REVIEW - 1954 

TIGER PAPER - PELICAN PLIGHT 1980 

WILDLIFE VERSUS TOURISM - YOJANA - 1981 

LETTERS - GENERAL

FROM N V KRISHNA WARRIER 

FROM NG PILLAI, BNHS 

MADRAS CHRISTIAN COLLEGE DIARY 1942-43 

NAMMUDE PAKSHIKAL - 1950

MATHRUBHOOMI 1947-48

JANTHUSASTHRAM - 1923