Source:Olsen, Sarah. Descendants of Alexander McKay

"Our goal is to research the pioneers that came into the Walla Walla Valley Area, as a starter for those doing their family genealogy"

This is from the old web site for the Frazier Farmstead Museum, but it does not seem to be on their current web site.

This source is cited in some Wikipedia articles, but some errors were quickly found, so it would be wise to double check any information.