Search for: Title Author Subject Series that begins with: 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings > Browse Headings # Petroleum 49 SEE ALSO narrower term: Heavy oil 3 SEE ALSO narrower term: Petroleum products 8 Petroleum -- Abstracting and indexing -- Statistics -- Periodicals. 1 Petroleum -- Abstracts -- Periodicals. 1 Petroleum -- Africa. 1 Petroleum -- Africa, Central -- Maps. 1 Petroleum -- Africa, North -- Maps. 1 Petroleum -- Africa, Southern -- Maps. 1 Petroleum -- Africa, West -- Maps. 1 Petroleum -- Alaska, Gulf of (Alaska) -- Maps. 1 Petroleum -- Alaska -- Maps. 2 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings >