305 books • 45 series
Book #1: Borrowing
Book #26: Farming
Book #68: New True Books
Book #80: Astronomy
Book #26: Drug Abuse
Book #26: Heredity
Book #26: Nuclear Energy
Book #25: Space Telescope
Book #26: Skylab
Book #26: Spacelab
Book #26: Moon Flights
Book #65: Halley's Comet