Heidegger's Copy of Rickert's Die Grenzen der naturwissenschaftlichen Begriffsbildung with annotations.

http://www.martin-heidegger.org/

Martin Heidegger: Research Tools

Martin Heidegger Bibliography/Writings (by year) (.pdf format)
Martin Heidegger List of courses, seminars and lectures
Martin Heidegger Letters (Sources)
Martin Heidegger Life: who was who
Martin Heidegger as a Student
Martin Heidegger Teachers
Martin Heidegger Chronology
German English Glossary (.doc)
Martin Heidegger Chronology
Martin Heidegger Bibliography of cited authors and works
Martin Heidegger Publishers
Martin Heidegger Archival Library Resources