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Practical jokes (4)
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Pragmatism (1)
Prairie ecology (7)
Prairie plants (2)
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Prang, Louis, 1824-1909 (1)
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Precious stones (2)
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Predatory animals (5)
Preemptive attack (Military science). (1)
Pregnancy (7)
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Prehistoric peoples (4)
Prejudice (2)
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Presentation graphics software (5)
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Preservation of organs, tissues, etc. (1)
President's Council on Bioethics (U.S.). (1)
President's Council on Physical Fitness and Sports (U.S.). (1)
Presidential candidates (15)
Presidential libraries (8)
Presidents (144)
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Presley, Elvis, 1935-1977 (4)
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Prion diseases (27)
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Project Apollo (U.S.) (3)
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Prokofiev, Sergey, 1891-1953. (1)
Prokudin-Gorskii, Sergei Mikhailovich, 1863-1944 (3)
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Propositional calculus. (1)
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Protein kinases. (1)
Proteins (45)
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Protista (5)
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Purcell-Cutts House (Minneapolis, Minn.). (1)
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Puryear, Martin, 1941- (2)
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Quileute Tribe of the Quileute Reservation, Washington (1)
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Radio (8)
Radio astronomy. (4)
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Radioisotopes in geology. (2)
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Radiology. (3)
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Rael, Juan Bautista (1)
Ragtime music (4)
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Railroads (50)
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Raleigh (N.C.) (2)
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Rand Corporation (4)
Random matrices. (1)
Ranganathan, S. R. (Shiyali Ramamrita), 1892-1972 (1)
Range ecology (1)
Range management (3)
Rap (Music) (1)
Rape (8)
Raper, George, 1769-1797. (1)
Rapid prototyping (5)
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Rate of return (1)
Rats (2)
Rauschenberg, Robert, 1925-2008 (2)
Raw materials (1)