Examines the history of Maryland, from its colonization by England to the early years of its statehood. Includes brief biographical sketches of key figures.
Describes the general characteristics of comets and gives a brief history of Halley's comet discussing its expected reappearance in late 1985-early 1986.
Describes in simple terms the meteors, comets, and asteroids that are part of our solar system and discusses the various theories concerning their origin and their effect on life on Earth.