Tim picked up a road-killed Barred Owl from near his house which is probably in decent enough condition to end up in the Andrews collection.
The pattern of the primary coverts is (per Pyle) supposedly helpful in aging them. We came to the conclusion that this was probably an adult, though the difference didn't seem to be as great as in the book's figure.
Here's the bill. The facial feathering projects so far forward in owls that you don't see much of the bill.