Dewey Decimal System: 21st edition
000 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900
100 Philosophy & psychology
101 Theory of
philosophy
102 Miscellany of philosophy
103 Dictionaries of philosophy
104 Not assigned or no longer used
105 Serial publications of philosophy
106 Organizations of philosophy
107 Education, research in philosophy
108 Kinds of persons in philosophy
109 Historical treatment of philosophy
110 Metaphysics
111
Ontology
112 Not assigned or no longer used
113
Cosmology (Philosophy of nature)
114 Space
115 Time
116 Change
117 Structure
118 Force & Energy
119 Number & quantity
120 Epistemology, causation, humankind
121
Epistemology (Theory of knowledge)
122
Causation
123
Determinism & indeterminism
124
Teleology
125 Not assigned or no longer used
126 The self
127 The unconscious & the subconscious
128 Humankind
129 Origin & destiny of individual souls
130 Paranormal phenomena
131
Occult methods for achieving well-being
132 Not assigned or no longer used
133
Parapsychology &
occultism
134 Not assigned or no longer used
135 Dreams & mysteries
136 Not assigned or no longer used
137 Divinatory
graphology
138
Physiognomy
139
Phrenology
140 Specific philosophical schools
141
Idealism & related systems
142 Critical philosophy
143
Intuitionism &
Bergsonism
144
Humanism & related systems
145
Sensationalism
146
Naturalism & related systems
147
Pantheism & related systems
148
Liberalism,
eclecticism,
traditionalism
149 Other philosophical systems
150 Psychology
151 Not assigned or no longer used
152 Perception, movement, emotions, drives
153 Mental processes & intelligence
154 Subconscious & altered states
155 Differential & developmental
psychology
156 Comparative psychology
157 Not assigned or no longer used
158 Applied psychology
159 Not assigned or no longer used
160 Logic
161
Induction
162
Deduction
163 Not assigned or no longer used
164 Not assigned or no longer used
165
Fallacies & sources of error
166
Syllogisms
167
Hypotheses
168 Argument & persuasion
169
Analogy
170 Ethics (Moral philosophy)
171 Systems & doctrines
172 Political ethics
173
Ethics of family relationships
174 Economic & professional ethics
175 Ethics of recreation & leisure
176 Ethics of sex & reproduction
177 Ethics of social relations
178 Ethics of consumption
179 Other ethical norms
180 Ancient, medieval, Oriental philosophy
181 Oriental philosophy
182
Pre-Socratic Greek philosophies
183
Sophistic &
Socratic philosophies
184
Platonic philosophy
185
Aristotelian philosophy
186
Skeptic and
Neoplatonic philosophies
187
Epicurean philosophy
188
Stoic philosophy
189 Medieval Western philosophy
190 Modern Western philosophy
191 Modern Western philosophy United States & Canada
192 Modern Western philosophy British Isles
193 Modern Western philosophy Germany & Austria
194 Modern Western philosophy France
195 Modern Western philosophy Italy
196 Modern Western philosophy Spain & Portugal
197 Modern Western philosophy Soviet Union
198 Modern Western philosophy Scandinavia
199 Modern Western philosophy Other geographical areas