1964 CR Classification System 1 General Topics and Education 1.0 General 1.1 Texts; Handbooks 1.2 History; Biographies 1.3 Introductory and Survey Articles 1.4 Glossaries 1.5 Education 1.50 General 1.51 High School Courses and Programs 1.52 University Courses and Programs 1.53 Certification; Degrees; Diplomas 1.59 Miscellaneous 1.9 Miscellaneous 2 Computing Milieu 2.0 General 2.1 Philosophical and Social Implications 2.10 General 2.11 Economic and Sociological Effects 2.12 The Public and Computers 2.19 Miscellaneous 2.2 Professional Aspects 2.3 Legislation Regulations 2.4 Administration of Computing Centers 2.40 General 2.41 Administrative Policies 2.42 Personnel Training 2.43 Operating Procedures 2.44 Equipment Evaluation 2.45 Surveys of Computing Centers 2.49 Miscellaneous 2.9 Miscellaneous 3 Applications 3.1 Natural Sciences 3.10 General 3.11 Astronomy; Space 3.12 Biology 3.13 Chemistry 3.14 Earth Sciences 3.15 Mathematics; Number Theory 3.16 Meteorology 3.17 Physics; Nuclear Sciences 3.19 Miscellaneous 3.2 Engineering 3.20 General 3.21 Aeronautical; Space 3.22 Chemical 3.23 Civil 3.24 Electrical; Electronic 3.25 Engineering Science 3.26 Mechanical 3.29 Miscellaneous 3.3 Social and Behavioral Sciences 3.30 General 3.31 Economics 3.32 Education; Welfare 3.33 Law 3.34 Medicine; Health 3.35 Political Science 3.36 Psychology; Anthropology 3.37 Sociology 3.39 Miscellaneous 3.4 Humanities 3.40 General 3.41 Art 3.42 Language Translation and Linguistics 3.43 Literature 3.44 Music 3.49 Miscellaneous 3.5 Management Data Processing 3.50 General 3.51 Education; Research 3.52 Financial 3.53 Government 3.54 Manufacturing; Distribution 3.55 Marketing; Merchandising 3.56 Military 3.57 Transportation; Communication 3.59 Miscellaneous 3.6 Artificial Intelligence 3.60 General 3.61 Induction and Hypothesis-formation 3.62 Learning and Adaptive Systems 3.63 Pattern Recognition 3.64 Problem-solving 3.65 Simulation of Natural Systems 3.66 Theory of Heuristic Methods 3.69 Miscellaneous 3.7 Information Retrieval 3.70 General 3.71 Content Analysis 3.72 Evaluation of Systems 3.73 File Maintenance 3.74 Searching 3.75 Vocabulary 3.79 Miscellaneous 3.8 Miscellaneous 3.80 General 3.81 Communications 3.82 Industrial Process Control 3.83 Telemetry; Missiles; Space 3.89 Miscellaneous 3.8 Miscellaneous 3.80 General 3.81 Communications 3.82 Industrial Process Control 3.83 Telemetry; Missiles; Space 3.89 Miscellaneous 4 Programming 4.0 General 4.1 Processors 4.10 General 4.11 Assemblers 4.12 Compilers and Generators 4.13 Interpreters 4.19 Miscellaneous 4.2 Programming Languages 4.20 General 4.21 Machine Oriented Languages 4.22 Procedure and Problem Oriented Languages 4.29 Miscellaneous 4.3 Supervisory Systems 4.30 General 4.31 Basic Monitors 4.32 Multiprogramming; Multiprocessing 4.39 Miscellaneous 4.4 Utility Programs 4.40 General 4.41 Input/Output 4.42 Debugging 4.43 Program Maintenance 4.49 Miscellaneous 4.9 Miscellaneous 5 Mathematics of Computation 5.0 General 5.1 Numerical Analysis 5.10 General 5.11 Error Analysis: Computer Arithmetic 5.12 Function Evaluation 5.13 Interpolation; Functional Approximation 5.14 Linear Algebra 5.15 Nonlinear and Functional Equations 5.16 Numerical Integration and Differentiation 5.17 Ordinary and Partial Differential Equations 5.18 Integral Equations 5.19 Miscellaneous 5.2 Metatheory 5.20 General 5.21 Formal Logic 5.22 Automata; Turing Machines 5.23 Mechanical and Algorithmic Languages 5.24 Theory of Programming 5.29 Miscellaneous 5.3 Combinatorial and Discrete Mathematics 5.30 General 5.31 Sorting 5.32 Graph Theory 5.39 Miscellaneous 5.4 Mathematical Programming 5.40 General 5.41 Linear and Nonlinear Programming 5.42 Dynamic Programming 5.49 Miscellaneous 5.5 Mathematical Statistics; Probability 5.6 Information Theory 5.9 Miscellaneous 6 Design and Construction 6.0 General 6.1 Logical Design; Switching Theory 6.2 Computer Systems 6.20 General 6.21 General Purpose Computers 6.22 Special Purpose Computers 6.29 Miscellaneous 6.3 Components and Circuits 6.30 General 6.31 Circuit Elements 6.32 Arithmetic Units 6.33 Control Units 6.34 Storage Units 6.35 Input/Output Equipment 6.36 Auxiliary Equipment 6.39 Miscellaneous 6.9 Miscellaneous 7 Analog Computers 7.0 General 7.1 Applications 7.2 Design; Construction 7.3 Hybrid Systems 7.4 Programming; Techniques 7.9 Miscellaneous