http://www.stltoday.com/news/local/obituaries/leo-drey-dies-missouri-s-largest-private-landowner-until-he/article_736f1bd8-6103-5202-aad0-7f74cb8f9234.html
From the St. Louis Post-Dispatch - his obituary.
http://www.bizjournals.com/stlouis/news/2015/05/27/timber-baron-conservationist-leo-drey-dies.html
This article includes information about the west St. Louis County Queeny Park.
http://openspacestl.org/commemorating-leo-drey/
St. Louis Open Space Council
http://www.ladfoundation.org/ Leo A. Drey or L - A - D website.