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- [28] OXIDE MINERALS IN LITHIC FRAGMENTS FROM LUNA-20 FINES TRANSACTIONS-AMERICAN GEOPHYSICAL UNION, 1973, 54 (04): : 355 - 355
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- [30] NATURAL EXOELECTRONIC EMISSION OF ANORTHOSITE ROCKS BROUGHT BY LUNA-20 PROBE DOKLADY AKADEMII NAUK SSSR, 1973, 209 (03): : 586 - 588