The Death Certificate of August A Busch Sr.
The below can be found at the Missouri State Archives in PDF form, along with any other Missouri death certificate from 1910 to X-51, where X = the current year. (Currently 1910-1956. We are assuming that they will continue to expand the collection each year.)
Not everyone you might expect to find there, has a death certificate. If someone died overseas, even if they were brought back to Missouri to be buried, they don't have a Missouri death certificate. For example, August A's father, Adolphus Busch, died while visiting his hometown of Germany in 1913.
Additionally .... The University of Missouri has several online St. Louis Social Registers from 1916-1925.
The above images and links reduces the difficult aspects of the below to a matter of reading, and following links.
