Practical Astronomy with your Cal- paperback, 9780521356992, Peter Duffett-Smith

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

Practical Astronomy with your Ca... by Duffett-Smith, Peter Paperback / softback

Practical Astronomy with Your Calculator Paperback Peter Duffett-

Practical Astronomy with your Calculator by Peter Duffett-Smith

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

Practical Astronomy with Your Calculator Paperback Peter J. Duffe

Astronomy with your Personal Computer