en

Practical astronomy with your calculator

Peter Duffett-Smith · 1979

188 pages · ~5h read

health · science

en

Astronomy with your personal computer

Peter Duffett-Smith · 1985

256 pages · ~6h read

health · science

en

Practical astronomy with your calculator or spreadsheet

Peter Duffett-Smith · 1753

238 pages · ~6h read

health · science