I have a file of Kastens from St. Louis that I can't match to my family yet. One name that matches yours it William August - listed on the SS application of Edward Kasten who I thought was my family. Don't think he is. Edward was born 4-24-1885 to William August Kasten & Catherine Becker. I also have Catherine's death notice 10/28/1918 @ 78 years, 2021 Miami (South St. Louis) mother of Laua, Ida, William, Adolph, Henry, Albert & Edward. Funeral from Ziegenhein Bros, Cherokee St. Also, Henry's obit 11-21-1919 @ 43 evidenly not married, listed only as brother of the above children of Catherine's. Hope they belong to you. Wish I could find mine!