The Missouri Secretary of State web site has a searchable database of images of death certificates for the state of Missouri from 1910 -1969. It can be found at https://s1.sos.mo.gov/Records/Archives/ArchivesMvc/ . If you have anyone in your family tree that died in the State of Missouri between these years, I encourage you to search the database. Over a period of a few days, I searched my genealogy database for anyone that died in Missouri during these years. I didn't find every one of them but I did find 58, from just about every branch of my family tree. Several of these gave me new information such as parents, spouses and death dates that I didn't have before. Some causes of death I saw were burned due to a child playing with fire, to typhus, to electrocution.
Here are the Missouri death certificates I found during this search that are most closely related to me. Others are more distantly related and in-laws.
My third cousin, 20 day old, Ann Elizabeth Bixenman
My father's first cousin once removed, Christopher Bixenman
My great-granduncle, Colonel John Huntz Bixenman.
My father's first cousin twice removed, Charles Neason. I just noticed that it lists his birthplace as Carthage, Missouri. He was actually born in Carthage, Illinois.