Families and Performance of the Morgan Stock Horse by Brenda Tippin. The Morgan Horse Magazine, Dec. 1988

In the last column above, there is mention of a pedigree "see Figure 1", but there is no pedigree. So here it is--

https://www.allbreedpedigree.com/trix+hill

Also, here is a photo of this horse from the AllBreed site--

Second column below--a reference to Sid Spencer as "he". Nope, Sid was a she!