Daly, Reginald. <br/><br/>
Earth's most challenging mysteries. 

 - Grand Rapids,  Baker Book House  [1972] 
 - 403 p.  21 cm. 
<br/><br/>Bibliography: p. 397-403. 
<br/><br/><label>ISBN: </label>0801028175 
<br/><br/><label>LCCN: </label>73168176  
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Earth (Planet)--Miscellanea.
<br/><br/><label>LC Class. No.: </label>QE53  / .D35 
<br/><br/><label>Dewey Class. No.: </label>550  / D153e