Robertson, Robert Hugh Stannus. <br/><br/>
Mineral use guide :  or Robertson's spiders' webs / 
by R. H. S. Robertson. 
 - London :  Cleaver-Hume Press,  1960. 
 - 44 p. :  ill. ;  20 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Economic.