Varentsov, I. M.  <br/><br/>
Sedimentary manganese ores / 
by I. M. Varentsov. 
 - Amsterdam:  Elsevier Publishing Co.,  1964. 
 - 119 p. :   ill. ;   25 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Manganese ores.<br/>Manganese ores--Russia.