Here are some excellent sources of information on economic growth, growth research, history, and historical macroeconomic data.
Bristol. This website is maintained by Professor Jonathan Temple at the University of Bristol.
Word Bank. This website was until recently maintained by dr. William Easterly at the World Bank.
Groningen. This website features a useful database that includes, among other things, figures for GNP per hour worked.
History of Economic Thought. This website is maintained by the New School of Social Research in New York.
Historical data. This website is maintained by the University of Rhode Island.
Selected books on growth
Growth Theory: An Exposition by Robert M. Solow (Oxford University
Theory of Economic Growth by W. Arthur Lewis (George Allen and Unwin,
Economic Growth by Robert Barro and Xavier Sala-i-Martin (McGraw-Hill,
1995; 2nd ed. 2003).
Endogenous Growth Theory by Philippe Aghion and Peter Howitt (MIT Press,
Theories of Economic Growth
from David Hume to the Present, by W. W. Rostow (Oxford University
Introduction to Economic Growth by Charles I. Jones (W. W. Norton, 1998;
2nd ed. 2002).
Economic Growth by David N. Weil (Addison Wesley, 2005).
Development Economics by Debraj Ray (Princeton University Press, 1998).
The Elusive Quest for Growth: Economists' Adventures and Misadventures in the
Tropics by William Easterly (MIT Press, 2001).
The End of Poverty: Economic Possibilities for Our Time by Jeffrey D.
Sachs (Penguin Press, 2005).