Petrov, V P <br/><br/>
Perlite and vermiculite 
/ Indian National Scientific Documentation Centre 
 - New Delhi:   Indian National Scientific Documentation Centre,   1973 
 - 217p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology
<br/><br/><label>Universal Decimal Class. No.: </label>553.535+553.678  / L3