Gregersen, Erik

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The Britannica Guide to Analysis and Calculus (Math Explained)

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The Britannica Guide to Electricity and Magnetism (Physics Explained)

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The Britannica Guide to Heat, Force, and Motion (Physics Explained)

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Manned Spaceflight (An Explorer's Guide to the Universe)

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Astronomical Observations: Astronomy and the Study of Deep Space (An Explorer's Guide to the Universe)

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Asteroids, Meteors, Meteorites, and Comets (Universe and Our Place in It)

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The Britannica Guide to the History of Mathematics (Math Explained)

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The Sun and the Origins of the Solar System (Universe and Our Place in It)

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