radial faultsradial flow fanradial jacking testradioactivity methodradiometetric sortingradius of destructionraggingrail benderrail haulage systemraiseraise borerrake anglerake classifierramprandom variablerangerare earth elementsrated capacityrated horse powerraw coalrayleigh wavesraymond millreal solutionsrear dump truckrear support legsrecession curverecharge areareciprocating compressorreciprocating pumpreciprocation screenreclaimerreclamationrecleanerrecoveryrecovery testrectangular exploration gridrectifierrecumbent foldreduction by netreduction by splitterreduction ratioreefrefiningreflectancerefractory orerefuseregional metamorphismregionalized variableregularizationregulator