(1959). Aavarthana Krishiyude Aavasyakatha. Kottayam: Rubber Research Institute of India.
1959. Aavarthana Krishiyude Aavasyakatha. Kottayam: Rubber Research Institute of India.
Aavarthana Krishiyude Aavasyakatha. Kottayam: Rubber Research Institute of India. 1959.
