Skinner, Brian J.  1928- <br/><br/>
Earth resources / 
by Brian J. Skinner 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1969 
 - ix, 149 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0132226537 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources<br/>Natural resources--United States