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Automatic Silver Recovery Unit Iron Sand Mining Arizona

Maps 1 item United States showing the value of production of gold silver copper lead zinc and iron ore by state and district yielding over 100000 1928. SEE ALSO 70.14. 70.5 RECORDS OF HEALTH AND SAFETY UNITS 1910-72. Related Records Additional records relating to health and safety under 70.2.3. 70.5.1 General records

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