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MAPPING IRRIGATED CROPLAND ON THE HIGH PLAINS USING LANDSAT = CARTOGRAPHIE DES TERRES IRRIGUEES SUR LES HAUTS PLATEAUX A L'AIDE DE LANDSATTHELIN GAIL P; JOHNSON THOMAS L; JOHNSON ROBERT A et al.1981; PROC. ANNU. WILLIAM T. PECORA MEM. SYMP. REMOTE SENSING; ISSN 0278-3878; USA; DA. 1981; NO 5; PP. 715-721; BIBL. 4 REF.; 2 TAB. ; ILL.Conference Paper