Sources:
http://dialect.redlog.net/staticmaps/q_21.html
https://www.wildflower.org/plants/result.php?id_plant=cail2
https://farmtogether.com/learn/blog/a-brief-history-of-pecans
https://www.hudsonpecan.com/blogs/news/history-of-the-pecan
https://www.tshaonline.org/handbook/entries/pecan-industry
https://www.tshaonline.org/handbook/entries/pecan-shellers-strike
https://www.tsl.texas.gov/ref/abouttx/symbols.html
https://www.okhistory.org/publications/enc/entry.php?entry=ST023