It just occurred to me that Greg Bahnsen's Van Til's Apologetic: Readings and Analysis and John Frame's Cornelius Van Til: An Analysis of His Thought should be included in the Van Til collection (although I guess you could just stick Frame's in his collection). And while I'm on the subject, it would be convenient to have the works of Gordon Clark (even though I'm not a huge fan, I would definitely buy it).
