MODE OF OCCURRENCE OF PLATINUM, PALLADIUM, AND RHODIUM IN CHROMITITE.GRIMALDI FS; SCHNEPFE MM.1969; GEOL. SURV. U.S.A., PROF. PAPER; USA; 1969, P. 149 A 151Miscellaneous

DETERMINATION OF PALLADIUM AND PLATINUM IN ROCKS.GRIMALDI FS; SCHNEPPE MM.1968; GEOL. SURV. U.S.A., PROF. PAPER; USA; 1968, P. 99 A 103Miscellaneous

DETERMINATION OF RHODIUM IN ROCKS.SCHNEPFE MM; GRIMALDI FS.1968; GEOL. SURV. U.S.A., PROF. PAPER; USA; 1968, P. 210 A 213Miscellaneous

DETERMINATION OF PALLADIUM IN THE PARTS-PER-BILLION RANGE IN ROCKS.GRIMALDI FS; SCHNEPFE MM.1967; GEOL. SURV. U.S.A., PROF. PAPER; USA; 1967, P. 141 A 144Miscellaneous