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461. Depleting Outer Asteroids//Sky and Telescope. 1997, June.
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464. Hubble Data Put Universe at 13 Billion Years of Age // The Toronto Star. 1997, May 01.
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471. New Asteroid Bearing Down on Earth // Associated Press.
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473. Paleomagnetism// Britannica: Encyclopedia. CD-ROM. ©1996.
474. Paleontological Research // Britannica: Encyclopedia. CD-ROM. ©1996.
475. Planet X// Britannica: Encyclopedia. CD-ROM. ©1996.
476. Polynesian Mythology. Wellington (New Zealarid). Undated.
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480. Structure and Evolution of the Martian Interior // Britannica: Encyclopedia. CD-ROM. ©1996.
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482. The Case for Europa's Ocean // Sky and Telescope. 1997, June.
483. The Diversity of Cretaceous Biota // Britannica: Encyclopedia. CD-ROM. ©1996.