Have Bygdebok for the Fla Parish in Melhus, published in1974. It contains family and farm history of the gards within the Fla Parish. Ron Flaa's family roots are within the Flaa
Parish, but the family lived on the Dal/Dahl Farm. When John Olsen and his spouse, Marit Jonsdtr left Dalshaugen and came to America in 1867, they took the parish name as their surname. They likely did that to be a "Beacon" for other Tronder Emigrants from that area of Melhus, such as my own grandparents. They settled permanently in
LacQuiParle County in Minnesota.
Other Bygdeboks of that area that I own and love are Rennebu, Melhus, Horg, Storen.
Soknedal, Buvik, Borsa, Skaun and others. Contact me if you need help. I will try.