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I am glad to help. I realized that perhaps you are not yet familiar with the Familysearch.org website. It is one worth playing with and becoming familiar.....especially since you now have a name of a town. It means that the descendents of Wilhelmine's or her ancestors lived there. You may be able to trace her sisters or brothers down the line a bit (or back a bit) to get more information. when you write in a name, many names come up. I immediately go to Germany, printed in the upper left in a box, and click on it, and get as a complete of listing of ALL the Wilhelmine Mankes of Germany, instead of the Swedish, English, etc. ones! Then I click on that name and usually the parents names come up. I copy that info-(everything.) I have even clicked on information on that website to see what else came up---ususally you get the information about microfiche numbers and church of the Latter Day Saints data, but I have stumbled on the names of the parishes of that region, or the names of several towns, so that I can locate that region on a map or atlas. Not always though. It depends on what was documented.
From there I might go back to the beginning of the search and plug either of the parents name into the search engine. Or I can even plug the father's name and the mother's name into the parents side of the search engine---leaving all other blanks open. This allows a list of all of their children that have been registered in that church or by the town, to appear. You need to make sure the church or village matches with the ones you are searching for. It does not print the children by a second marriage or if there is a move out of that region. It a system that scans THAT church record or that village.
I am still learning new tricks when I use it, and it helps to plug in the variations of spellings. You can look for marriages, by scanning different years that that person MIGHT marry. If a person was born in 1840, they probably married around 1860. It is helpful to remember that there were many deaths back then, so there might have been a second marriage with more children later. You must be also be willing to play around and try different variations. For example, I found a brother of some descendents by discovering someone had printed Baether on either the internet or the original records and it was misprinted or misread, and the real name was Raether. I have only used this for about 3 months now, but it has been the most helpful of all searches because I can scan up to 40 years at a time if I ask it to (+or - 20 years, it states). I have found some possible relatives as far back as the 1500's on it. It is a good place to start. Bless your efforts. I enjoy helping, because I still need it myself. (I am a teacher by trade, so this is easy for me to do,) Thanks for the appreciation. Sue