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Pricing Resources
U.S. Producer Price Index
Measures the average change over time in the selling prices received by domestic producers for their output. The prices included in the PPI are from the first commercial transaction for many products and some services.
National Minerals Information Center
Statistics and information on the worldwide supply of, demand for, and flow of minerals and materials essential to the U.S. economy, the national security, and protection of the environment.
ICIS Academic Link
This provides downloads for students and academics. This includes historical chemical prices.
The ICIS Global Petrochemical Index (IPEX) provides a capacity-weighted measure of the average change in petrochemical prices over time.
Nelson-Farrar Production
Processing and refining 1906-2014