These are called Ahnenpaß, or Ahnenpass (if you don’t have in ß character in the font you are using. They were a booklet of about 24 pages to fill out with your direct ancestors’ vital statistics and religion.
These were personal “documents,” and had to be produced in certain situations, and then were returned. All the entries had to be notarized to be valid. They were not collected in any central location.
In filling them out a person had to get official, certified copies, ie, legal copies, of birth/baptism and marriage records. You entered the data in the booklet, then took the booklet and the documents to be notarized.
Because of the racial nature and purpose these were often destroyed after the War, but of course, many do still exist. It is sometimes possible to buy them from vendors of Third Reich memorabilia.
If you are interested in the history around these, and Nazi racism in general, read Eric Ehrenreich’s book “The Nazi Ancestral Proof.” This was published in 2007 and may still be in print. This book developed out of Ehrenreich’s graduate dissertation, I believe.
You can also do a google search for Ahnenpaß and you will get a fair amount of information about them, along with images of the cover and interior pages.