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The Clash "The Cost of Living EP"
I can never pick one in these discussions, so you'll have to bear with me! The Stooges - Sick of You and Gun Club - Death Party. The EP format was great for socially aware punk bands like The Clash and SLF both of whom released more than one EP at the normal price for a 45 single with one track either side. My two favourites offer a long song on one side with two shorter ones on the other.