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MINING JOURNAL RESEARCH SERVICE. OCT. 6, 1994. REPORTCOMPILED FOR LAWRENCE LIVERMORE NATIONAL LAB.USGS MINERAL RESOURCES DATA SYSTEM (MRDS). 1994.ILZIG WORLD DIRECTORY. JUNE 1988.MINING MAGAZINE. AUG. 1969. VOL. 121, NO. 2, P. 126.WORLD MINES REGISTER 1981-82.U.S. DEPT. OF STATE. UNCLASSIFIED AIRGRAM. 1979.UNITED NATIONS. MISSION TO ALGERIA-SEPT.11-OCT.7, 1993.G.A. TREMBLAY. PROJECT ALG/87/013.EUROPA PUBLICATIONS LTD. THE MIDDLE EAST AND NORTH AFRICA1994. 40TH ED.MINING MAGAZINE SEPT 76, TABLE B-1126 MINES ACCOUNTING FOR 9LL OUTPUT OTHER THAN COAL P 236WORLD MINES REGISTER 1976/77 P 15METALS SOURCEBOOK 1/29/73 ITEM NO (A1027)ENGINEERING AND MINING JOURNAL, 1975, P. 162.ARAB MINING JOURNAL, APRIL 1981, VOL. 1, NO. 3.DE KUN, N., 1965, THE MINERAL RESOURCES OF AFRICA, ELSEVIERPUBLISHING CO., NY.ENGINEERING AND MINING JOURNAL DIRECTORY OF MINING, 1981,P. 261.WORLD MINING, CATALOG, SURVEY, AND DIRECTORY, NO.1980,P.151.WORLD MINING, CATALOG, SURVEY, AND DIRECTORY, NO. 1974,P.131WORLD MINING, OCTOBER 1972, P. 46.WORLD MINING OCTOBER 1972, P. 46.