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Paleoanthropology
98
Paleobotany
68
Paleogeography
18
Paleontology
1,398
Palladium
10
Paper Technology
19
Paranormal Phenomena
1,939
Particle Physics
327
Perfect Numbers
13
Periodic Table
62
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31
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95
Petrology
0
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5
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64
Philosophy
6,412
Philosophy of Science
293
Phosphorus
10
Physical Anthropology
37
Physics
4,637
Physics, Qualitative
2
Pi
81
Planetariums
106
Planets
622
Plant Biology
721
Plant Pathology
117
Plant Physiology
75
Plasma Physics
321
Plastic
14
Platinum
10
Platinum Metals
1
Pluto
27
Plutonium
13
Policy about Science and Technology
50
Political Science
940
Pollution, Air
664
Pollution Prevention and Recycling
135
Pollution, Water
19
Polonium
10
Polyhedra and Polytopes
58
Polymers
80
Polyominoes
96
Population Studies
95
Potassium
10
Potential Theory
3
Poultry
105
Power Electronics
25
Prairies
17
Praseodymium
9
Precalculus
13
Primates
36
Prime Numbers
72
Probability
106
Promethium
9
Propulsion
56
Protactinium
8
Psychology
3,404
Public Policy
34
Pyrotechnics
91
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