Think about keywords related to your topic in general, or a specific context, material, or focus, to start your search in the library's catalog, WorldCat@SU. When you find a good item, try the subject links to lead to more resources on the topic. Also browse the shelf nearby for related titles. Ask your librarian for advanced search tips!
Try some of these subject headings in WorldCat:
Oil Wells | Petroleum industry and trade | Oil spills | Economic history | Ecology | Oil fields | Gas wells Petroleum industry and trade- Government policy | Petroleum products | Petroleum- economic aspects | Petroleum industry and trade- Social aspects