| 其他書名 | Ancestry and Descendants of Three Helms Cousins from Beerfelden Parish : Johann Friederich Helm, B. 1730; Johann Nicolaus Helm, B. 1714; Johann Jacob Helm, B. 1726 |
| 出版 | Timbercreek Limited, 1992 |
| URL | http://books.google.com.hk/books?id=5aRRAAAAMAAJ&hl=&source=gbs_api |