179 Passport To Danger
Franklin W. Dixon
The Hardy Boys Mystery Stories (179)
The Secret Panel
The Hardy Boys (25)
Rama II (Rama Series)
Gentry Lee & Sir Arthur C. Clarke
Observing and Measuring Visual Double Stars
R. W. Argyle
The Anguished Dawn
James P. Hogan; James P. Baen
The Green Hills of Earth and The Menace from Earth
Robert A. Heinlein
Halo: First Strike
Eric S. Nylund
Orphan star
Alan Dean Foster