au.\*:("KOPTJAEV AF")
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GEOCHEMISTRY OF RARE EARTHS IN OLD CONGLOMERATES.KOPTJAEV AF.1969; GEOKHIMIJA; SUN; 1969, NUM. 0007, P. 894 A 899Miscellaneous
ORIGINE DE L'ILMENITE ET DU RUTILE DES CONGLOMERATS ANCIENS.KOPTJAEV AF.1970; TRUDY INST. GEOL. GEOKHIM., SVERDLOVSK; SUN; 1970, NUM. 0086, P. 126 A 131Miscellaneous