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Metallurgy -- Study and Teaching -- Photographs (1)
Metalurgia -- Enseñanza (1)
Metalworking industry -- Equipment and supplies -- Photographs (1)
Mine Matayeguas; (1)
Mining center; (1)
Mining industry and finance (1)
Mining industry and finance -- Study and teaching (1)
Mining industry and finance -- study and teaching (1)
Montoya Montoya, Hernando, 1919- 2000 -- Fotografías (1)
Monumentos conmemorativos -- Fotografías (1)