Derivatives 114 Semiconductors 83 Optoelectronic devices 80 Literature 77 Dissertations, Academic (Ph.D) 76 Library classification schemes 71 Decimal Classification 63 Derivative securities 59 Social Sciences 40 Electronics 37 Engineering 37 Religion 35 Electronic circuits 33 Literature Hindi 32 Nanotechnology 32 Hinduism 30 Nanostructured materials 30 Biochemistry 29 Novel 29 Photonics 27 Literature Malayalam 26 Biography 24 History 24 Bengali fiction 22 English drama 22 Calculus 21 Classification 21 Physics 21 Economics 20 Islam & religions derived from it 20