Operations research 514 Literature 466 Literature Sanskrit 367 Epic Poetry Sanskrit 293 Production and operations management--Product management 291 Operating systems (Computers) 176 Operating systems 161 Optics 142 Engineering & allied operations 120 Operational calculus-- Functional analysis-- Mathematics 109 Operations Research-- Information management-- Executive management 106 History 104 Operations management 100 Philosophy 95 Epic 88 Production and operations management 85 Fiber optics 81 History and criticism 81 Nonlinear optics 81 Optical communications 81 Operations Research--Information management--Executive management 80 Co-operative management 76 Poetry Epic Sanskrit 75 Co operation 67 Management 65 Physics 64 Operator theory 61 Religion 59 Light & paraphotic phenomena (Optics); Physics 58 Philosophy Osho 56