Discussions of "modern" Protestant concepts of time and space makes this an interesting time-warp. Written in 1969. Has so little happened in our knowledge of understanding (not just of scientific understanding, but also theological understanding) that this book stands the test of time? Doubtful.

I'm sure more are forthcoming, since these are now available in Kindle versions through Amazon and Christian Book Distributors, including the classics mentioned by people above. What will determine my decision -- to order now or to wait -- will depend on Logos' plans. When will more or all volumes be available, and will there be special pricing? (Kindle volumes through Amazon are roughly $50 less for these seven volumes).