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Keywords from Image Description:
OIL SHALE. IT IS THE KEROGEN IN THIS ROCK WHICH WHEN HEATED TO F. YIELDS OIL NARA . Scope and content General notes Local identifier DA Environmental Protection Agency NARAAuthor Hiser David Photographer File OILSHALE ITISTHEKEROGENINTHISROCKWHICHWHENHEATEDTOF YIELDSOILNARA tif tif File OILSHALE ITISTHEKEROGENINTHISROCKWHICHWHENHEATEDTOF