Pearse, G.H.K. <br/><br/>
Silica /  
G.H.K. Pearse. 
 - Ottawa :    Dept. of Energy, Mines and Resources,    19746 
 - 8 p. ;    25 cm. 
 - 19754 ;    no. 42 .
<br/><br/><label>Subjects--Topical Terms: </label><br/> Silica.
<br/><br/><label>Gov. Doc. Class. No.: </label>G CAN E64 (08) 3/44