Social Security Records
Social security records are a great sources of birth dates, death dates, and often other information like place of death.
As the concerns about identity theft increased, the information provided has been cut back. Records are now released 3 years after the death and do not include the actual number anymore.
You can search online at Familysearch.org and other sites for social security records
Here is my compilation which includes many records before the information was cut back. I also have images of application forms for some Biele individuals.
Bernard Biele application form
Carl Biele application form
Charles Biele application form
Edith Biele application form
Eugene Biele application form
Eve Biele application form
Frederick Biele application form
Irene Biele application form