I've been doing a lot of research the two last years about the family from Toftekalven, because my husband has his ancestors from that place.
There are loads of letters that has sent beetwen Norway and Iowa, and also lots of pictures. We also have pictures of alot of the Holm-family in Iowa, amongst Thea Martha.
I know this reply to your search comes late, bit if you have any interest in knowing more and sharing information, please let me know.
Kindest regards, Margaret Mehus, Norway