Most of the facts presented appears to be from personal correspondence between the author and with the individuals listed when living. He asked them to provide genealogical information and primary sources when available. The author seems to imply that not everyone provided the same level of detail and documentation during this process <ref name="page 13" />. | Most of the facts presented appears to be from personal correspondence between the author and with the individuals listed when living. He asked them to provide genealogical information and primary sources when available. The author seems to imply that not everyone provided the same level of detail and documentation during this process <ref name="page 13" />. |