OK, OK. Probably two different families with almost unbelievable similarities in names and dates...
You'll still be able to order the parish records for Skien Telemark at your nearest LDS Family History Center and the earlier records you'll want for the birthplaces of Gunder Nirisen in Saude (that is listed as Sauherad in the library catalog) and Maren Hansdatter in BÃ¸e (listed as BÃ¸). You have at least approximate birthyears from thecensus to use to find their births/baptisms in the parish records. Those entries will list the grandparents and lead to earlier entries.
The LDS library catalog informs us that Skien parish records are available for years as early as 1659.
Sauherad parish records available for years as early as 1649 AND bygdebÃ¸ker have been published for the area - "Bygdebok for Sauherad", 5 volumes by unknown author; "Den Gamle Stulen: foto-dokumentarisk skildring frÃ¥ Sauherad kringhundreÃ¥rsskiftet", by Torstein Braaten. (I think the first of those is available on LDS microform - but double check the catalog yourself.)
For BÃ¸ the library catalog lists that parish records as early as 1689 are available and the following bygdebÃ¸ker are also in their collection "BÃ¸-Soga I: Telemark, by Gunnar Lunde; "BÃ¸-soga II : Telemark, gards og Ã¦ttesoga", 4 volumes by Stain Hennesied and Gregar NordbÃ¸.
If you haven't used Norwegian parish church records or bygdebÃ¸ker before you can learn about how they can help in this collection of instructions - http://homepages.rootsweb.com/~norway/articles.html
The RootsWeb Telemark specific mailing list might be useful to you - someone participating might already have resources for one or more of those areas. (That mailing list has been reading all of our correspondence here since your first query posted - there is an option to be able to browse items already 'discussed' on that mailing list.) On the banner at the top of this page you'll see "Mailing Lists" - click on that and follow it on down to Norway lists - and the Telemark list will be under that link. Instructions on how to 'subscribe' will be provided.
If you are interested in contacting volunteer(s) who might have resources for these Telemark districts and are willing to do limited LOOKUPs, check at these web locations - http://www.rootsweb.com/~norway/lookups.htmlhttp://www.rootsweb.com/~wgnorway/lookups.htmlhttp://www.rootsweb.com/~bwo/
I'll be shaking my head about this case for some time - but there's no reason you can't forge ahead with the information you've already been given. Most of all - have a lot of fun!!! and the very best of luck!!!