To the link-vault, Robin!
I'll explain my purpose next week. For now, your tax dollars at work (worth it, I think).
From the Energy Information Administration:
(click the chart for a spreadsheet of prices,
the link above for the full chart and notes)
My query was answered:
4. Oil embargo begins (October 19-20, 1973)
5. OPEC freezes posted prices; US begins mandatory oil allocation
6. Oil embargo ends (March 18, 1974)World Nominal Oil Price Chronology: 1970-2006
Here's a hint to what I was thinking.