Jeffreys, Harold <br/><br/>
Earth  :Its origin history and physical constitution/4th ed. 

 - 4th ed. 
 - Cambridge  university press  1962 
<br/><br/><label>Subjects--Index Terms: </label>Tidal friction  Long period tides  Observational seismology 
<br/><br/><label>Dewey Class. No.: </label>551  / J9