We have been going down this road for years. @mayhaw9999 and i both know Warren was discovered and the evidence of its breeding does not exist any longer. He knew the gentleman the pear is named after. The reason magness comes up is because the only study that might be found would be on magness not warren. At this point i will be content to grow my warren trees and be satisfied with the heavy yields i get.
https://npgsweb.ars-grin.gov/gringlobal/accessiondetail?id=1436384
https://npgsweb.ars-grin.gov/gringlobal/accessiondetail?id=1436235