Travis is correct, they are cut from the Blue Ribbon Malt posters. The posters are actually surprisingly not too tough to find, but are usually fairly beat up when you do find them (probably due to the awkward size).
I have honestly never really understood why the SCD book lists these cards as singles as they weren't intended to be cut up. Also the pictures on the poster aren't even all the same size--some are narrow some are wide, etc.
-Rhett
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