This link is to a value investing blog maintained by a Columbia University graduate, who currently works as a buy side investment analyst in Manhattan, which serves as a fantastic database of superb value investing resources.
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We point you directly to the investment letters of the Chou Associates Fund.  These date back to 1997 and run to the most recent quarter.  This amazing resource gives time stamped insight into the thinking of a truly independent investment mind.
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This website from the Heilbrunn Center for Graham & Dodd Investing provides insights and links to  excellent research on value investment.  This is the university that Ben Graham lectured on value investment, where Warren Buffett and many other great value investors attended.
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This website from the Ben Graham Center for Value Investing provides some wonderful research and interviews with some value investing legends.
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And the Walter Schloss archives.
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Also Warren Buffett’s legendary article published in 1984 on ‘The Superinvestors of Graham-and-Doddsville.
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The Brandes Institute provides some very well written and value oriented research from a partner institute for the well-established value investor. 
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This is a PDF link to the seminal value investment book Margin of Safety: Risk-Averse Value Investing Strategies for the Thoughtful Investor by Seth Klarman, written in 1991. This is a must read for all serious value investors. 
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