Unconventional energy resources-studies of development Division <4=four> proceedings of the tenth world energy conference held at Istanbul from <19=nineteen> - <23=twentythree> September <1977=one thousand nine hundred seventyseven> 

 - Istanbul  WEC-CME  1977 
<br/><br/><label>Universal Decimal Class. No.: </label>620.93(047.3)  / TEN.77