Nils Larsen and Astri Knutsdtr. -Bakke Meren, Lier

Would appreciate help in finding information relative to my g...grandparents Nils Larsen and Astri Knutsdtr. who are mentioned as living on Hestemyr (bnr. 23) under Bakke-Meren in Lier, Buskerud from 1801. Nils and Astri are married in Eggedal, Buskerud on 30 May 1790. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8502&idx_id=8502&uid=ny&idx_side=-164 Their first son, Knut, was bap. Jan 1794 at Hougeneje in Eggedal, Buskerud. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8503&idx_id=8503&uid=ny&idx_side=-9 Their second son, Niels, was bap. Jan 1797at Skadelandeje in Eggedal, Buskerud. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8503&idx_id=8503&uid=ny&idx_side=-25 Their third child, Ingeborg, was bap. Jul 1803 at Meheneje in Lier. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8440&idx_id=8440&uid=ny&idx_side=-85 Their third son, Lars, was bap. in Jun and died in Aug 1805 at Meren in Lier. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8440&idx_id=8440&uid=ny&idx_side=-106 http://www.arkivverket.no/URN:kb_read?idx_kildeid=8440&idx_id=8440&uid=ny&idx_side=-203 Their forth son, Lars was bap. in 21 Sep 1806 at Meren in Lier. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8440&idx_id=8440&uid=ny&idx_side=-120 Nils Larsen died 10 Dec 1832 at the age of 79 at Mehreneje. This indicates that he was born abt. 1753. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8446&idx_id=8446&uid=ny&idx_side=-297 Astri Knutsdtr. died 14 Oct 1810 at the age 48 at Wiger in Lier. This indicates that she was born abt 1762. http://www.arkivverket.no/URN:kb_read?idx_kildeid=8440&idx_id=8440&uid=ny&idx_side=-216 Nils Larsen married the second time to Mari Christensdtr. in Oct. 1816. I have done a search in Liers and Sigdal bygdeboks for info that would provide clues as to Nils and Astri's births and parents but have found nothing. I would appreciate any information as to these two people. Thank You, Gene Nelson, Stillwater, Minnesota