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2 Results for KEROGEN

Only 1 Shortz Era entry found. Click the date to see the answer in context.

DateGridClueAuthor
Tuesday, March 1, 201637AOil-producing matter in shaleFreddie Cheng

1 result for KEROGEN from older pre-Shortz puzzles.

DateGridClueAuthorEditor
Friday, November 30, 199042ASource of shale oilJesse RoarkeMaleska

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