To get financial statements (income statement, balance sheet, cash flows) as well as SEC filings (10k, 10Q, 8K, Proxy Statements), Rod Library has two excellent resources available:
Standard & Poor's NetAdvantage and Mergent Online.
S&P NetAdvantage typically has five years worth of this information. Mergent goes further back. In some cases it may have 30 years worth of data/information.
Both can be found alphabetically on the library's A-Z Databases list.