https://texashistory.unt.edu/ark:/67531/metapth35097/m1/embed/
The link above is to a Dallas Historical Society journal published in 2002. On page 39 begins the article "Wynnewood - A Tonic to the Shelter-Hungry Nation" , a detailed history of the development of the addition.
Source information:
Dallas Historical Society. Legacies: A History Journal for Dallas and North Central Texas, Volume 14, Number 2, Fall, 2002, periodical, 2002; (https://texashistory.unt.edu/ark:/67531/metapth35097/: accessed November 7, 2021), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Dallas Historical Society.