kw.\*:("LOW-FREQUENCY METHODS")
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A DESCRIPTION OF AN EXTREMELY LOW FREQUENCY LOOP-LOOP GEOPHYSICAL SYSTEM = DESCRIPTION D'UN SYSTEME GEOPHYSIQUE BOUCLE-BOUCLE A TRES BASSE FREQUENCECOOKE J; BRADLEY J; MITCHELL C et al.1981; OPEN-FILE REP. (U. S. GEOL. SURV. 1978); ISSN 0196-1497; USA; DA. 1981; NO 81-1130; 64; ILL.Serial Issue
