Search for: Title Author Subject Series that begins with: 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings > Browse Headings # Oil-shales. 19 SEE ALSO narrower term: Oil shale reserves 1 Oil-shales -- Appalachian Basin -- Maps. 1 Oil-shales -- California. 1 Oil-shales -- Colorado. 20 Oil-shales -- Colorado -- Congresses. 1 Oil-shales -- Colorado -- Economic aspects. 1 Oil-shales -- Colorado -- Garfield County. 4 Oil-shales -- Colorado -- Green River. 1 Oil-shales -- Colorado -- Maps. 3 Oil-shales -- Colorado -- Parachute Creek. 3 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings >