Search U.S. government technical reports digitized or harvested by TRAIL.
The rare-earth elements, yttrium, and thorium;a materials survey,
Electrotransport of impurities in rare-earth metals, using a pulsed current
The economics of byproduct metals(in two parts). 2. Lead, zinc, uranium, rare-earth, iron, aluminum, titanium, and lithium systems / by Alfred Petrick, Jr., Harold J. Bennett, Karl E. Starch, and Robert C. Weisner.