1. U. S. Department of Labor, Bureau of Labor Statistics, Producer Price Indexes, Various monthly issues for producer price index data.
2. Wall Street Journal, Various issues for lumber futures prices.
3. Lumber Prices, Memorandum from the Environment and Natural Resources Policy Division, Congressional Research Service. Library of Congress, Washington DC, March 10, 1993.
4. Relative Prices and Money: A Vector Autoregression on Brazilian Data