Translation 65 Solar energy 49 History 47 മലയാളം; മലയാളസാഹിത്യം; മലയാളം കവിതകള്‍ 40 Arabic - English 37 Solar radiation 28 Organic chemistry 26 Solar system 26 India 25 Literature 24 Solar cells 23 Arabic- English 21 Bihar 20 Solar system; Astronomy 20 Microbiology 19 Biography 15 Malayalam; Malayalam Literature; Malayalam Poetry 15 Music 15 ORGANIC CHEMISTRY-- THE FUNDAMENTAL PRINCIPLES 15 Politics and government 15 Psychology, Clinical 15 Clinical psychology 14 Chemistry 13 Polarization 13 Malayalam; Malayalam Literature; Malayalam Poetry; Ulloor S Parameswara Aiyar 12 ORGANIC CHEMISTRY-- STEREOCHEMISTRY AND THE CHEMISTRY OF NATURAL PRODUCTS 12 Philosophy 12 Solar-energy engineering; Heat engineering; Applied physics 12 Education 11 Fiction 11