Jeremy- have already thought of seeing if he is still above ground! But go for it, if you have the time today!
Tim, I think we mean Columbian Rock thrown in there.
I already tried to trace down Perdue history to see, but nada on what chickens they used to use. I looked up Indian River Hatchery, too, but didn't get far - went for George Ellis, with a combo of his home town, the hatchery, Delawares.
Some links were gone.
I had looked on Feathersite ages ago when I first thought about Dels, but missed this article - I still want to contact the U of Del and the Ag department there - seems to me they would be a good source.