Reference books 15 Bibliography 6 Civilization 6 History 6 Reference book 6 Education 4 Kerala 4 Agriculture 3 Chemistry 3 Commonwealth countries 3 Commonwealth ministers 3 Dictionaries 3 Engineering 3 Foreign relations 3 Industrialization 3 International relations 3 Library science 3 Literature 3 Medical care 3 Music 3 Power resources 3 Telecommunication 3 Water-supply 3 Book industries and trade 2 Cloud computing 2 Culture 2 Culture-Kerala 2 Drama 2 Electronic reference services 2 Generalia Reference Source 2