21st Century's All New Cosmology - By Charles J. Sven. Explores the universe and the solar system both historically and with contemporary perspectives.
Sky Calendar - Illustrated, easy-to-follow guide to sky events from Abrams Planetarium. The observing guide is published in loose-leaf form and mailed quarterly.
Sputnik: The Shock of the Century - By Paul Dickson. Chronicle of the events and developments leading up to and emanating from Sputnik's launch.
