au.\*:("JOHNSTON ROBERT R")
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DRILLING ACTIVITY IN NORTH AMERICA DURING 1980 = L'ACTIVITE DE FORAGE EN AMERIQUE DU NORD AU COURS DE 1980JOHNSTON ROBERT R; ANONYMOUS.1981; AAPG BULL.; ISSN 0149-1423; USA; DA. 1981-10; VOL. 65; NO 10; PP. 1728-1756; BIBL. 38 REF.; ILL.Article