Unless otherwise stated, all data on Czechoslovakia come from the official publications of the Czechoslovak State Statistical Office: Statisticki ročenky (Statistical Yearbooks), the monthly Statistické zprávy (Statistical Reports) and the theoretical monthly Statistický obzor (Statistical Review). I express my appreciation for the use of statistical material available in these publications. Data from various Czechoslovak economic reviews and from official statements, as published by the Czechoslovak daily press or broadcast by Radio Prague and Radio Bratislava, also have been used as indicated in the text. In exceptional cases I have used my own computations, estimates, or approximations, which are clearly marked as such.
Statistical data on countries other than Czechoslovakia have been taken, unless otherwise stated, from the Statistical Yearbooks and from the Monthly Bulletin of Statistics of the United Nations. Among other sources, the publications of the Economic Commission for Europe and the Organization for European Economic Cooperation have been most useful. Occasionally, Soviet, Polish, Hungarian, and East and West German official statistics, as well as statistics from the international part of the Czechoslovak Statistical Yearbooks, have been used.
I am greatly indebted to Mr. George F. Ray, Senior Research Officer, British National Institute of Economic and Social Research, who read Chapters 6, 8, and 10 and the Conclusion; and to Mr. Peter G. Elkan (Cantab.), Research Officer of the Institute, who read the Introduction, Chapter 7, and the Conclusion. Both made valuable suggestions which I was happy to incorporate in my book. Mr. Roger Agile ( Paris), of the United Nations Secretariat in New York, kindly read and corrected the demographic part of Chapter 1. I profited from the seminar of Dr. A. Nove, London School of Economics and Social Science ( University of London), on the economic problems of the Soviet world. Czechoslovak economists also greatly helped me in interpreting the meaning of Czechoslovak statistics; Mr. Keith G. Lumsden, of Edinburgh and Stanford, kindly helped me to solve many theoretical problems. All the shortcomings of this study, how. ever, are my own unshared responsibility.