I don't have a specific "asset" in mind, although some great ones have been mentioned. What I would LOVE to see would be a set of "propositions" (they did not call them proposals) submitted by competing architects for any of the great old courses.
For example, my club has old board minutes which reference "propositions" received by Banks, Tillinghast, and Stiles & Van Kleek. (Donald Ross said he couldn't possibly take on more work at the moment.) I would kill to see those submissions, especially if preliminary routings were included. While I think Banks built a really good course, I can't help but wonder what Tillinghast would have done.
Does anyone know how in depth the ODG's went in their propositions to build courses? Did they just submit cost estimates or did they also show routings?