Here's another book series that looks fascinating and yet disappointing: Cambridge Philosophical Texts in Context. The idea is to collect together in one volume various (shorter) texts that led up to or resulted from a seminal work in philosophy. I think it's a wonderful idea; it would really whet one's appetite to dive into a particular work.
That's the good news. The bad news is that they've only published two books so far, the last one appearing ten years ago. They have volumes on Descartes' Meditations and Berkeley's Principles and Dialogues. I have the Descartes volume, and the only other book listed as forthcoming is on Kant's Groundwork on the Metaphysics of Morals, but it hasn't come out yet. I was so disappointed when I saw this. I'd love to see a volume for Husserl's Logical Investigations.
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