Mathematics 75 Statistics 67 Library classification schemes 61 Computer science 55 Philosophy 49 Electronics 44 Engineering 44 Biotechnology 40 Physics 40 Biochemistry 37 Economics 35 Programming languages-Basic 34 Social sciences 34 methods 34 Econometrics 33 BASIC (Computer program language) 30 History 30 Microbiology 30 Genetics 29 Education 28 Research 28 Chemistry 27 Computer 27 Data processing 25 Molecular biology 25 Psychology 25 Bioinformatics 23 Literature 22 Management 22 Algebra 20