(1965). Rubberine Bhadhikkunna Podikumil Rogam. Kottayam: Rubber Research Institute of India.
1965. Rubberine Bhadhikkunna Podikumil Rogam. Kottayam: Rubber Research Institute of India.
Rubberine Bhadhikkunna Podikumil Rogam. Kottayam: Rubber Research Institute of India. 1965.
