Gregersen, Erik
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The Britannica Guide to Electricity and Magnetism (Physics Explained)
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The Britannica Guide to Analysis and Calculus (Math Explained)
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Manned Spaceflight (An Explorer's Guide to the Universe)
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The Sun and the Origins of the Solar System (The Universe and Our Place in It)
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Astronomical Observations: Astronomy and the Study of Deep Space (An Explorer's Guide to the Universe)
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The Britannica Guide to the History of Mathematics (Math Explained)
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The Inner Solar System: The Sun, Mercury, Venus, Earth, and Mars (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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