Bruce, it used to be available through this site [
www.mamut.com] (As you can see from this page [
www.mamut.com] they still have "Våre motorskip"). I believe "Våre gamle skip" is out of print, but you could try writing to them, there's contact info at the first link.
Also, I believe it's available for sail at the Maritime Museum in Stavanger (it won't be listed on their website, but you can write to them, or call them)
[
www.stavanger.museum.no]
If the above fails, try writing to Hillesland Books [
www.hillesland.no]
I'm not sure if any of these will ship books out of Norway though, but it's worth a try.
Siri