Gatford, J. D.
Calculator exercises for year nine / J.D. Gatford, C. Pitman. - Melbourne : Longman Cheshire, c1979. - xi, 120 p. : ill.
0582685494
Calculators.
Mathematical instruments.
Calculator exercises for year nine / J.D. Gatford, C. Pitman. - Melbourne : Longman Cheshire, c1979. - xi, 120 p. : ill.
0582685494
Calculators.
Mathematical instruments.