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USGS Mineral Resources: PGE-Ni-Cr deposit and occurrence
From the site: "A compendium of previously published databases and database records that describe PGE, nickel, and chromium deposits and occurrences." -
Vanadium and nickel complexes in petroleum resid acid
Acid and base fractions from petroleum vacuum resids with no detectable (by visible spectrophotometry) quantities of porphyrinic Ni or V complexes were hydrotreated under...