For historical information look at Standard & Poor's Industry Surveys (658.05 ST) n the Main Stacks and Oak Street Facility (request only).
For a company's relative value vis a vis companies in its industry use Bloomberg, available in the Margolis Market Information Lab (MIL) at the Business Instructional Facility (BIF).
- Bloomberg: Type the company's ticker symbol, hit the EQUITY key and type RV, then hit Enter.