The future of small scale mining  first international conference / J. Barnea and G. P. Salas, scientific secretaries; R. F. Meyer and J. S. Carman, editors. 
sponsored by the United Nations Institute for Training and Research (UNITAR) and the Consejo de Recursos Minerales and Secretaria de Patrimonio y Fomento Industrial (SEPAFIN) of the Government of Mexico, in cooperation with the United Nations Development Programme ... [et al.], 26 November-5 December 1978, Jurica, Qro., Mexico; 
 - New York :  UNITAR : McGraw-Hill,  c1980. 
 - xxiii, 501 p. :  ill. ;  29 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources.<br/>Mining engineering.
<br/><br/><label>Dewey Class. No.: </label>338.2