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Robert Radford, M.A. (Québec, Canada)
- robertradford.com
Articles et livres de Robert Radford sur l'histoire, la technologie et la pédagogie.
Online conversion of imperial and metric units of measurement
- imperialtometric.com
Metric and imperial online conversion of units, notably centimeters, kilometers, inches, feet, acres, miles, metres, tons, ounces, pounds, litres, gallons and pints