00323nam a2200109Ia 4500008004100000082001900041245002600060260003100086300001300117490005900130650002400189140224s9999    xx            000 0 und d  a620.91 1977 L7  aEnergy fact book-1977  aVirginiabTetra Techc1977  axvii,vp.  aNational Technical Information Service TT-A-643-77-306  aEnergy Conservation