Fast Answers

General

• In Bloomberg click on the yellow CMDTY button (F9).
• Global Financial Data features commodity prices back to the 19th century. Use the GFDatabase and the data series types "commodity indices" or "commodity prices."

• For historical prices of options going back 6 years, take a look at Options Metrics in WRDS.
• The CRB Commodity Yearbook features historical commodity prices and a brief analysis of various commodities. In print in the Stamps Reading Room (Ref. HF 1040.C7).

Agricultural

• The U.S. Department of Agriculture Crops and Statistics Service gives production, yields and prices for agricultural commodities throughout the world. See also the USDA Foreign Agricultural Service PSD Online.
• Consult the Guide to Food and Agriculture Organization (FAO) Documents from Harvard College Library.

Metals and Minerals

• See the Minerals Information from the U.S. Geological Survey.