00573nas a22002414a 4500001000800000003001100008005001700019008004100036040002600077041000800103044000700111245001200118260004400130300002300174310001000197362003600207655001300243710003900256866000900295866000900304866000900313866000900322GMR-640AR-SsjUBGM20251028230909.0251021k19601969gy ar g 000 0 eng d bspacAR-SsjUBGMeaacr aeng agy00aReport. aGeorgetown :bGeological Survey,c1960- av. :bil. ;c26 cm aAnual1 aEn biblioteca años 1960-1969. 4aMemorias1 aGuyana.bGeological Surveyeeditor 0a1960 0a1961 0a1963 0a1969