A common technique was to find birth records of someone known later to have died.
There are no birth records or other evidence for these claims.
Once the child is 18, they have the right to apply for their original birth records.
Despite the controversy, birth records in California are public record.
Some children may not even have had birth records, the authorities say.
At the time, many people did not know their actual birth records.
In Oregon, all birth records were open until 1957, when the state changed the law.
He had at least two more children around this time, but their birth records have yet to be found.
A second study compares the birth records of 48 children with cancer to 480 without.
And somewhere in there should be her own birth record.