Perrings Charles Black mineworkers in central Africa industrial strategies and the evolution of an African proletariat in the copperbelt 1911-41 - London Heinemann 1979 - xv,293p. cm. Standard No.: 257,520 Source: Textual Subjects--Topical Terms: ECONOMICS Dewey Class. No.: X9(H113):9.613.N41<--N11, L9