Library science 44 History 41 Information science 39 General 36 Libraries 36 Education 29 Historia 29 Educación 28 Books and reading 24 School libraries 21 Documentation 20 Information storage and retrieval systems 19 Library Science 19 Bibliothe`ques 17 Bibliothe ́conomie 15 Periodicals 14 Bibliography 13 Bibliotecología 12 Ciencias de la información 11 Pe ́riodiques 11 Publishers and publishing 11 Academic libraries 10 Bibliotheekwezen 10 Book industries and trade 10 Books 10 Information Systems 10 Science 10 Social Science 10 Bibliotecas escolares 9 Computers 9