<Astronomy, Physics & Mechanics

Animate and the Inanimate

Astronomy: The Science of the Heavenly Bodies

Astronomy: the Sun and His Family

Atom and the Ocean

Atomic Bombings of Hiroshima & Nagasaki

Conversations on the Plurality of Worlds

Dialogo dei Massimi Sistemi

Earth and Sun: An Hypothesis of Weather and Sunspots

Easy Lessons in Einstein

Einstein and the Universe

Einstein Theory of Relativity

Faraday As A Discoverer

Flatland: A Romance of Many Dimensions (version 2)

Flying Saucers are Real

General Principle of Relativity: In Its Philosophical and Historical Aspect

Golden mean to 5000 digits

Great Astronomers

Heavenly Bodies: Their Nature and Habitability

History of Astronomy

History of Astronomy

Introduction to Einstein

Kingdom of the Heavens

Letters on Different Subjects in Natural Philosophy, Volume 1 (Letters to a German Princess)

Little Masterpieces of Science - The Skies and The Earth

Mars and Its Canals