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0200066889 20050105095246.0 s1954 gw a fr |000|||ger | NGL a761 Perow, Walentin Aleksandrovich. Feinmahlen der Erze / Walentin Aleksandrovich Perow und W.J. Brand. Berlin : Verlag Technik, 1954. 190 p. : ill. ; 24 cm. Ore-dressing. ; Crushing machinery. aBrand, W. J. NGL 140950-51 761 P42 aglj b2 eglj0405