Energy in history : papers of the fellows of the Institute of Czechoslovak and World History of the CSAS to the 11th Symposium of the International Cooperation in History of Technology Committee (ICOHTEC), Lerbach, September2-7, 1984 - Purš, Jaroslav, 1922-1997 (Institute of Czechoslovak and World History of the Czechoslovak Academy of Sciences, 1984)