Edwards, Allen.
The hand-held calculator in a Third-world country / Allen Edwards. - Port Moresby : Numeracy Project, Laloki College, 1982.
Number concept.
Mathematics--Study and teaching--Papua New Guinea.
Calculators.
Non-formal education--Papua New Guinea.
The hand-held calculator in a Third-world country / Allen Edwards. - Port Moresby : Numeracy Project, Laloki College, 1982.
Number concept.
Mathematics--Study and teaching--Papua New Guinea.
Calculators.
Non-formal education--Papua New Guinea.