Magnet earth  [videorecording] 

 - London :  BBC Enterprises,  1980 
 - 1 videocassette (U-matic) (50 min.) :  sd., col. ;  3/4 in. 
 - Horizon [videorecording] .
<br/><br/> A report on the progress of research into the earth's magnetic field 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth--Magnetism<br/>Magnetism, Terrestrial