au.\*:("HELAL AH")
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STRATIGRAPHY OF OUTCROPPING PALEOZOIC ROCKS AROUND THE NORTHERN EDGE OF THE ARABIAN SHIELD (WITHIN SAUDI ARABIA).HELAL AH.1968; Z. DTSCH. GEOL. GESELLSCH.; DEU; 1968(12), VOL. 117, NUM. 2-3 , P. 506 A 543Miscellaneous
AEQUIDENSITEN-BILDER IN DER GEOLOGIE. = IMAGES DES EQUIDENSITES EN GEOLOGIE.KAMINSKI H; HELAL AH.1971; UMSCHAU WISSENSCH. TECH.; DEU; 1971(9), VOL. 71, NUM. 0019, P. 739 A 742Miscellaneous