Prices of Crude Oil, Natural Gas, Bituminous Coal and Lignite, and Anthracite by Year.
E7.2 data frame has 32 rows and 5 columns.
Prices are in 1972 cents (U.S) by 1000 BTU.
This data frame contains the following columns:
a numeric vector, year of observation.
a numeric vector, price of oil.
a numeric vector, price of Gas.
a numeric vector, price of Bituminous Coal and Lignite.
a numeric vector, price of Anthracite.
Darrel Sala, Institute of Gas Technology, Chicago.
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