Astronomy with Your Personal Computer Paperback Peter J. Duffett-

Python Playground: Geeky Projects for the Curious Programmer

Practical Astronomy: A User-Friendly Handbook for Skywatchers

Practical Astronomy with your Calculator

Principles of Physics : A Calculus-Based Text Hardcover

Practical Astronomy With Your Calculator (Second Edition) SC Spiral (1985)

Astronomy with your Personal Com... by Duffett-Smith, Peter Paperback / softback

Practical Astronomy with your Calculator, Duffett-Smith, Peter, Very Good Book