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- [1] EXOELECTRONIC EMISSION OF PARTICLES OF LUNAR ANORTHOSITE ROCKS SUPPLIED BY AUTOMATIC STATION LUNA-20 GEOKHIMIYA, 1973, (05): : 683 - 688
- [7] QUANTITY OF RB-87/SR-87, RARE-EARTHS AND K, RB, SR, BA IN LUNAR SOIL COLLECTED BY SOVIET PROBE LUNA-20 COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE D, 1972, 275 (11): : 1095 - &