Richard A. Proctor

Easy Lesson in the Differential Calculus

Light Science for Leisure Hours

Pleasant Ways in Science

Myths and Marvels of Astronomy

Flowers of the Sky

Chance and Luck

Easy Star Lessons

Half-hours with the telescope

Wages and Wants of Science Work

Orbs Around Us

Other Worlds Than Ours

Myths and Marvels of Astronomy (Classic Reprint)

The Great Pyramid Observatory, Tomb, and Temple (Classic Reprint)