408 books • 48 series
Book #3: Regulae ad directionem ingenii
Book #6: Principles of Philosophy
Book #4: Oeuvres Philosophiques. Tome I - 1618-1637
Book #5: Oeuvres Philosophiques. Tome II 1638-1642
Book #6: Oeuvres Philosophiques. Tome III - 1643-1650