Floberg, Leif <br/><br/>
The earth's invisible walls and their lethal intersections / 
Leif Floberg 
 - Lund :  Lund Technical University,  1994 
 - 67 p. :  ill. ;  21 cm. 
<br/><br/><label>ISBN: </label>9188558061 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Magnetic fields--Physiological effect<br/>Trees--Effect of radiation on--Sweden
<br/><br/><label>Dewey Class. No.: </label>538