| Reference | {Production:: ALUMINUM PRODUCTION COST SURVEY, 1980-1985 BROOK HUNT AND}{Production:: ASSOCIATES LTD. PG.275 (RECORDS 1-4,7)}{Production:: ALUMINUM PRODUCTION COST SURVYEY, 1988 BROOK HUNT AND ASSOC-}{Production:: IATES LTD. PG.2.20 (RECORDS 5,6,8,9)} |